GOLDEN STATE WATER CO - BARSTOWlikely match

City water report · 2026

Is Barstow Tap Water Safe? 2026 Water Quality Report

Short answer: PFOA is above its federal limit (a 2024 limit that water systems have until at least 2029 to meet); lithium sits above a screening level. Golden State Water Co serves 32,445 residents.

Explore the findings What can I do?Follow

Likely match, check your bill

GOLDEN STATE WATER CO - BARSTOW serves Barstow

Your water bill or annual water quality report names your actual supplier.

Source: Groundwater

GOLDEN STATE WATER CO - BARSTOWThis report
CA3610043 · 32,445 served

What stands out

One PFAS above the 2024 federal limit

The bar is drawn in blocks of the 4.0 ng/L federal MCL (2024), so the length shows how far above it the result sits.

PFOA

Perfluorooctanoic acid

1.4× the limit

5.7ng/L

Each block = 4.0 ng/L federal MCL (2024)

EPA UCMR 5 · sampled 2023Evidence

Coverage by group

31 results on record

PFAS (forever chemicals)
1 above · 3 detected · 25 not detected
Metals & lead
1 detected
Disinfection by-productsNot monitored
Other
1 above

Every detected result

6 detected results, by distance from their limit

GOLDEN STATE WATER CO - BARSTOW (EPA PWSID CA3610043) delivers groundwater to 32,445 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.

LithiumEPA UCMR 5 · 2023
10 µg/L EPA health reference level (screening, not a legal limit)
21.9µg/L
Above screening
Perfluorooctanoic acid (PFOA)EPA UCMR 5 · 2023
4.0 ng/L federal MCL (2024)
5.7ng/L
Above limit
Perfluorohexanesulfonic acid (PFHxS)EPA UCMR 5 · 2023
10 ng/L federal MCL (2024)
5ng/L
Within reference
Lead (90th percentile)EPA SDWIS (Lead & Copper Rule) · 2023
15 µg/L federal action level
1.6µg/L
Within reference
Perfluorohexanoic acid (PFHxA)EPA UCMR 5 · 2023
400,000 ng/L Michigan EGLE state MCL (strictest US state)
5.4ng/L
Within reference
Perfluoropentanoic acid (PFPeA)EPA UCMR 5 · 2023
No federal or state limit; shown for transparency
4.9ng/L
Detected · no limit

25 other contaminants tested, none detected

11Cl-PF3OUdS
4:2 FTS
6:2 FTS
8:2 FTS
9Cl-PF3ONS
ADONA
HFPO-DA (GenX)
NEtFOSAA
NFDHA
NMeFOSAA
PFBA
PFBS
PFDA
PFDoA
PFEESA
PFHpA
PFHpS
PFMBA
PFMPA
PFNA
PFOS
PFPeS
PFTA
PFTrDA
PFUnA

Track record

0health-based violations in the last 10 years

From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit.

Not in this recordDisinfection by-products weren't monitored in this dataset

No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.

What you can do

Test first, then treat what was found

01 · TestTest your own tap
Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
Certified lab
How to test your tap →
02 · Treat PFASReverse osmosis, or carbon certified for PFAS
PFOA 5.7 ng/L, above the 4 ng/L limit (+3 more PFAS detected)
NSF/ANSI 58 or 53, with PFOA/PFHxA/PFHxS/PFPeA named on the listing
Treatment for PFAS →
03 · LeadLead-certified carbon filter, or reverse osmosis
lead 1.6 µg/L, below the 15 µg/L action level
NSF/ANSI 53 (lead)
Treatment for Lead →

Understand water treatment technologies →

Test your own tap

Screening tells you if something is worth a closer look; a lab result is the number you can act on.

As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.

Screening: quick check, not lab-grade
Safe Home DIY Lead in Drinking Water Combo Test Kit
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
- Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Check price on Amazon
Lab-certified results
ETR Labs Basic Water Quality Test Kit
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
- Analyzed by Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638
- Turnaround: 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Check price on Amazon

When your results arrive, read them here →

Commercial

Certified for a concern found here

Each card names which Barstow findings its current certification covers, and which it doesn't.

As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.

Under-Sink Filter

Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200)

PFOA: eligible, evidence match
Lead: eligible, evidence match
Not established: Lithium, Perfluorohexanoic acid (PFHxA), PFHxS and 1 more

Not suitable for (5)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names
Anyone who can't plumb, drill or hire an installer
Renters who can't modify plumbing

See the evidence Check price on Amazon

Under-Sink Filter

Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)

PFOA: eligible, evidence match
Lead: eligible, evidence match
Not established: Lithium, Perfluorohexanoic acid (PFHxA), PFHxS and 1 more

Not suitable for (5)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names
Anyone who can't plumb, drill or hire an installer
Renters who can't modify plumbing

See the evidence Check price on Amazon

See all 13 products certified for a Barstow concern →

Countertop System

Aquasana Clean Water Machine Countertop Filter (AQ-CWM2)

PFOA: eligible, evidence match
Lead: eligible, evidence match
Not established: Lithium, Perfluorohexanoic acid (PFHxA), PFHxS and 1 more

Not suitable for (3)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names

See the evidence Check price on Amazon

Countertop System

Patriot Pure Ultimate Water Filtration System

PFOA: eligible, evidence match
Lead: eligible, evidence match
Not established: Lithium, Perfluorohexanoic acid (PFHxA), PFHxS and 1 more

Not suitable for (3)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names

See the evidence Check price on Amazon

Countertop System

AquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100)

PFOA: eligible, evidence match
Lead: eligible, evidence match
Not established: Lithium, Perfluorohexanoic acid (PFHxA), PFHxS and 1 more

Not suitable for (3)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names

See the evidence Check price on Amazon

Countertop System

AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)

PFOA: eligible, evidence match
Lead: eligible, evidence match
Not established: Lithium, Perfluorohexanoic acid (PFHxA), PFHxS and 1 more

Not suitable for (3)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names

See the evidence Check price on Amazon

Under-Sink Filter

Waterdrop G3P600 Tankless Reverse-Osmosis System

PFOA: eligible, evidence match
Lead: eligible, evidence match
Not established: Lithium, Perfluorohexanoic acid (PFHxA), PFHxS and 1 more

Not suitable for (5)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names
Anyone who can't plumb, drill or hire an installer
Renters who can't modify plumbing

See the evidence Check price on Amazon

Under-Sink Filter

Waterdrop G3P800 Tankless Reverse-Osmosis System

PFOA: eligible, evidence match
Lead: eligible, evidence match
Not established: Lithium, Perfluorohexanoic acid (PFHxA), PFHxS and 1 more

Not suitable for (5)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names
Anyone who can't plumb, drill or hire an installer
Renters who can't modify plumbing

See the evidence Check price on Amazon

Refrigerator Filter

Whirlpool Filter 3 Refrigerator Water Filter (WHR3RXD1)

PFOA: eligible, evidence match
Lead: eligible, evidence match
Not established: Lithium, Perfluorohexanoic acid (PFHxA), PFHxS and 1 more

Not suitable for (3)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names

See the evidence Check price on Amazon

Water Pitcher

Brita Elite Water Filter Pitcher

Lead: eligible, evidence match
Not established: PFOA, Lithium, Perfluorohexanoic acid (PFHxA) and 2 more

Not suitable for (3)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names

See the evidence Check price on Amazon

Water Pitcher

Culligan ZeroWater 10-Cup Pitcher (ZEROP10)

Lead: eligible, evidence match
Not established: PFOA, Lithium, Perfluorohexanoic acid (PFHxA) and 2 more

Not suitable for (3)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names

See the evidence Check price on Amazon

Faucet Attachment

PUR Plus Faucet Filter (FM2500V)

Lead: eligible, evidence match
Not established: PFOA, Lithium, Perfluorohexanoic acid (PFHxA) and 2 more

Not suitable for (3)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names

See the evidence Check price on Amazon

Under-Sink Filter

Frizzlife SP99 Under-Sink Filter

Lead: eligible, evidence match
Not established: PFOA, Lithium, Perfluorohexanoic acid (PFHxA) and 2 more

Not suitable for (4)

Treating every tap in the home
A whole-home hard-water or scale problem
All PFAS: its evidence covers only the compounds it names
Anyone who can't plumb, drill or hire an installer

See the evidence Check price on Amazon

Questions

Frequently asked questions

Is Barstow tap water safe to drink?

PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Barstow, PFOA 5.7 ng/L was measured above the 4 ng/L federal limit in EPA's 2024 testing; the lead 90th-percentile result was 1.6 µg/L against the 15 µg/L action level. GOLDEN STATE WATER CO - BARSTOW (PWSID CA3610043) has a Purity Score of 68/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.

Who provides tap water in Barstow?

GOLDEN STATE WATER CO - BARSTOW (PWS ID CA3610043) is the public water system on record for Barstow, California, serving about 32,445 people. Confirm the utility on your water bill before acting on a specific finding.

Where does Barstow get its drinking water?

Groundwater (primary source of record in EPA SDWIS).

Are PFAS "forever chemicals" in Barstow's water?

Yes. In EPA's UCMR 5 testing (2023-03-21 to 2023-09-27), PFOA was measured at 5.7 ng/L against a 4 ng/L federal limit. PFHxA (5.4 ng/L, below the 400,000 ng/L state limit) and PFHxS (5 ng/L, below the 10 ng/L federal limit) were also detected. PFPeA (4.9 ng/L) was also detected; it has no federal or state limit. Reverse osmosis and filters certified to NSF/ANSI 53 for PFOA/PFOS reduce them at the tap.

Is there lead in Barstow's tap water?

GOLDEN STATE WATER CO - BARSTOW's most recent lead 90th-percentile result (2023–2025) was 1.6 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

What does the latest Barstow water report show?

PurityMap's current record for Barstow holds 31 findings: 2 above a reference, 3 detected within the reference, 1 detected with no limit and 25 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.

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Sources and dataAll 31 records and their sourcesEPA UCMR 5 · EPA SDWIS (Lead & Copper Rule)

Contaminant	Result	Benchmark	Status	Sampled	Source
Lithium	21.9 µg/L	10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit	Above the referenced health-based guidance value	2023-03-21 to 2023-09-21	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluorooctanoic acid (PFOA)	5.7 ng/L	4.0 ng/L federal MCL (2024)	Above a historical reference; current applicability unverified	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluorohexanesulfonic acid (PFHxS)	5 ng/L	10 ng/L federal MCL (2024)	Within a historical reference; current applicability unverified	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Lead (90th percentile)	1.6 µg/L	15 µg/L federal action level	Below the listed reference	2023–2025 monitoring period	Lead & Copper Rule 90th-percentile: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluorohexanoic acid (PFHxA)	5.4 ng/L	400,000 ng/L Michigan EGLE state MCL (strictest US state)	Within a historical reference; current applicability unverified	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluoropentanoic acid (PFPeA)	4.9 ng/L	No federal or state limit; shown for transparency	Detected, no limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

25 other PFAS tested — none detected

Contaminant	Result	Benchmark	Status	Sampled	Source
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)	< 5 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)	< 5 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)	< 3 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)	< 5 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)	< 3 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)	< 2 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)	< 5 ng/L	10 ng/L federal MCL (2024)	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)	< 5 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)	< 6 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)	< 20 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)	< 3 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluoro-3-methoxypropanoic acid (PFMPA)	< 4 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluoro-4-methoxybutanoic acid (PFMBA)	< 3 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluorobutanesulfonic acid (PFBS)	< 3 ng/L	2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluorobutanoic acid (PFBA)	< 5 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluorodecanoic acid (PFDA)	< 3 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluorododecanoic acid (PFDoA)	< 3 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluoroheptanesulfonic acid (PFHpS)	< 3 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluoroheptanoic acid (PFHpA)	< 3 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluorononanoic acid (PFNA)	< 4 ng/L	10 ng/L federal MCL (2024)	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluorooctanesulfonic acid (PFOS)	< 4 ng/L	4.0 ng/L federal MCL (2024)	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluoropentanesulfonic acid (PFPeS)	< 4 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluorotetradecanoic acid (PFTA)	< 8 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluorotridecanoic acid (PFTrDA)	< 7 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
Perfluoroundecanoic acid (PFUnA)	< 2 ng/L	No federal or state limit; shown for transparency	Not detected above the reporting limit	2023-03-21 to 2023-09-27	UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Lithium

Result: 21.9 µg/L
Benchmark: 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit
Status: Above the referenced health-based guidance value
Sampled: 2023-03-21 to 2023-09-21
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluorooctanoic acid (PFOA)

Result: 5.7 ng/L
Benchmark: 4.0 ng/L federal MCL (2024)
Status: Above a historical reference; current applicability unverified
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluorohexanesulfonic acid (PFHxS)

Result: 5 ng/L
Benchmark: 10 ng/L federal MCL (2024)
Status: Within a historical reference; current applicability unverified
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Lead (90th percentile)

Result: 1.6 µg/L
Benchmark: 15 µg/L federal action level
Status: Below the listed reference
Sampled: 2023–2025 monitoring period
Source: Lead & Copper Rule 90th-percentile: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluorohexanoic acid (PFHxA)

Result: 5.4 ng/L
Benchmark: 400,000 ng/L Michigan EGLE state MCL (strictest US state)
Status: Within a historical reference; current applicability unverified
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluoropentanoic acid (PFPeA)

Result: 4.9 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Detected, no limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

25 other PFAS tested — none detected

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)

Result: < 5 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)

Result: < 5 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)

Result: < 3 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)

Result: < 5 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

4,8-Dioxa-3H-perfluorononanoic acid (ADONA)

Result: < 3 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)

Result: < 2 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)

Result: < 5 ng/L
Benchmark: 10 ng/L federal MCL (2024)
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)

Result: < 5 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)

Result: < 6 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)

Result: < 20 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)

Result: < 3 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluoro-3-methoxypropanoic acid (PFMPA)

Result: < 4 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluoro-4-methoxybutanoic acid (PFMBA)

Result: < 3 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluorobutanesulfonic acid (PFBS)

Result: < 3 ng/L
Benchmark: 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluorobutanoic acid (PFBA)

Result: < 5 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluorodecanoic acid (PFDA)

Result: < 3 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluorododecanoic acid (PFDoA)

Result: < 3 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluoroheptanesulfonic acid (PFHpS)

Result: < 3 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluoroheptanoic acid (PFHpA)

Result: < 3 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluorononanoic acid (PFNA)

Result: < 4 ng/L
Benchmark: 10 ng/L federal MCL (2024)
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluorooctanesulfonic acid (PFOS)

Result: < 4 ng/L
Benchmark: 4.0 ng/L federal MCL (2024)
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluoropentanesulfonic acid (PFPeS)

Result: < 4 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluorotetradecanoic acid (PFTA)

Result: < 8 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluorotridecanoic acid (PFTrDA)

Result: < 7 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Perfluoroundecanoic acid (PFUnA)

Result: < 2 ng/L
Benchmark: No federal or state limit; shown for transparency
Status: Not detected above the reporting limit
Sampled: 2023-03-21 to 2023-09-27
Source: UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)

Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.

UCMR5 Analytical Results
UCMR5 Analytical Results: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
US EPA
Published
2026-01-15
Newest sample
2023-09-27
Findings here
30
View source ↗Source record
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: GOLDEN STATE WATER CO - BARSTOW (CA3610043)
US EPA SDWIS
Published
2026-07-09
Newest sample
2025
Findings here
1
View source ↗Source record

Methodology: how we analyze water.

Data & methodologyHow we analyze waterData integrity policy

Something off with your water's smell, color or taste?

Start with the hot-or-cold tap check. Where Golden State Water Co reported something related, it's shown below.

Rotten-egg smell
Cloudy or milky water
Chlorine smell
Brown or yellow water
Metallic taste
Lead at Golden State Water Co: 1.6 µg/L (90th percentile, 2023–2025 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.

ZIP codes in Barstow

A ZIP code is a postal area, not a water service area. Your water bill names your supplier.

GOLDEN STATE WATER CO - BARSTOW serves Barstow

One PFAS above the 2024 federal limit

Perfluorooctanoic acid

Coverage by group

6 detected results, by distance from their limit

Test first, then treat what was found

Test your own tap

Safe Home DIY Lead in Drinking Water Combo Test Kit

ETR Labs Basic Water Quality Test Kit

Certified for a concern found here

Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200)

Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)

Aquasana Clean Water Machine Countertop Filter (AQ-CWM2)

Patriot Pure Ultimate Water Filtration System

AquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100)

AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)

Waterdrop G3P600 Tankless Reverse-Osmosis System

Waterdrop G3P800 Tankless Reverse-Osmosis System

Whirlpool Filter 3 Refrigerator Water Filter (WHR3RXD1)

Brita Elite Water Filter Pitcher

Culligan ZeroWater 10-Cup Pitcher (ZEROP10)

PUR Plus Faucet Filter (FM2500V)

Frizzlife SP99 Under-Sink Filter

Frequently asked questions

Something off with your water's smell, color or taste?

ZIP codes in Barstow