PFOA
3.5× the limitPerfluorooctanoic acid
14ng/L
Each block = 4.0 ng/L federal MCL (2024)
EPA UCMR 5 · sampled 2023Evidence
City water report · 2026
Is Lake Arrowhead Tap Water Safe? 2026 Water Quality Report
Short answer: Two PFAS, PFOA and PFOS, are above their federal limits (2024 limits that water systems have until at least 2029 to meet); 3 more are detected with no federal limit, and everything else measured is within its reference or not detected. Lake Arrowhead CSD serves 7,038 residents.
Likely match, check your bill
LAKE ARROWHEAD CSD serves Lake Arrowhead
Your water bill or annual water quality report names your actual supplier.
- Source
- Surface water
- LAKE ARROWHEAD CSDThis reportCA3610005 · 7,038 served
What stands out
Two PFAS above the 2024 federal limit
Each 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.
PFOS
1.8× the limitPerfluorooctanesulfonic acid
7.2ng/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)2 above · 6 detected · 21 not detected
- Metals & lead1 not detected
- Disinfection by-productsNot monitored
- Other1 not detected
Every detected result
8 detected results, by distance from their limit
LAKE ARROWHEAD CSD (EPA PWSID CA3610005) delivers surface water to 7,038 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.
- Perfluorooctanoic acid (PFOA)EPA UCMR 5 · 20234.0 ng/L federal MCL (2024)14ng/LAbove limit
- Perfluorooctanesulfonic acid (PFOS)EPA UCMR 5 · 20234.0 ng/L federal MCL (2024)7.2ng/LAbove limit
- Perfluorononanoic acid (PFNA)EPA UCMR 5 · 202310 ng/L federal MCL (2024)4.6ng/LWithin reference
- Perfluorohexanesulfonic acid (PFHxS)EPA UCMR 5 · 202310 ng/L federal MCL (2024)3.3ng/LWithin reference
- Perfluorohexanoic acid (PFHxA)EPA UCMR 5 · 2023400,000 ng/L Michigan EGLE state MCL (strictest US state)6.7ng/LWithin reference
- Perfluorodecanoic acid (PFDA)EPA UCMR 5 · 2023No federal or state limit; shown for transparency3.9ng/LDetected · no limit
- Perfluoroheptanoic acid (PFHpA)EPA UCMR 5 · 2023No federal or state limit; shown for transparency5.7ng/LDetected · no limit
- Perfluoropentanoic acid (PFPeA)EPA UCMR 5 · 2023No federal or state limit; shown for transparency4.5ng/LDetected · no limit
23 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
- PFDoA
- PFEESA
- PFHpS
- PFMBA
- PFMPA
- PFPeS
- PFTA
- PFTrDA
- PFUnA
- Lithium
- Lead (90th percentile)
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
A tap test can confirm levels at your home before you choose treatment.
Certified labHow to test your tap → - 02 · Treat PFASReverse osmosis, or carbon certified for PFAS
PFOA 14 ng/L, above the 4 ng/L limit (+7 more PFAS detected)
NSF/ANSI 58 or 53, with PFOA/PFOS/PFHxA/PFHxS/PFNA/PFDA/PFHpA/PFPeA named on the listingTreatment for PFAS →
Commercial
Certified for a concern found here
Each card names which Lake Arrowhead 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
- PFOS: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), PFHxS, Perfluorononanoic acid (PFNA) and 3 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
Under-Sink Filter
Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)
- PFOA: eligible, evidence match
- PFOS: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), PFHxS, Perfluorononanoic acid (PFNA) and 3 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 all 9 products certified for a Lake Arrowhead concern →
Countertop System
Aquasana Clean Water Machine Countertop Filter (AQ-CWM2)
- PFOA: eligible, evidence match
- PFOS: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), PFHxS, Perfluorononanoic acid (PFNA) and 3 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
Countertop System
Patriot Pure Ultimate Water Filtration System
- PFOA: eligible, evidence match
- PFOS: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), PFHxS, Perfluorononanoic acid (PFNA) and 3 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
Countertop System
AquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100)
- PFOA: eligible, evidence match
- PFOS: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), PFHxS, Perfluorononanoic acid (PFNA) and 3 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
Countertop System
AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)
- PFOA: eligible, evidence match
- PFOS: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), PFHxS, Perfluorononanoic acid (PFNA) and 3 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
Under-Sink Filter
Waterdrop G3P600 Tankless Reverse-Osmosis System
- PFOA: eligible, evidence match
- PFOS: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), PFHxS, Perfluorononanoic acid (PFNA) and 3 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
Under-Sink Filter
Waterdrop G3P800 Tankless Reverse-Osmosis System
- PFOA: eligible, evidence match
- PFOS: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), PFHxS, Perfluorononanoic acid (PFNA) and 3 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
Refrigerator Filter
Whirlpool Filter 3 Refrigerator Water Filter (WHR3RXD1)
- PFOA: eligible, evidence match
- PFOS: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), PFHxS, Perfluorononanoic acid (PFNA) and 3 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
Questions
Frequently asked questions
Is Lake Arrowhead tap water safe to drink?
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Lake Arrowhead, PFOA 14 ng/L and PFOS 7.2 ng/L were measured above the 4 ng/L federal limit in EPA's 2024 testing. LAKE ARROWHEAD CSD (PWSID CA3610005) has a Purity Score of 57/100 (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 Lake Arrowhead?
LAKE ARROWHEAD CSD (PWS ID CA3610005) is the public water system on record for Lake Arrowhead, California, serving about 7,038 people. Confirm the utility on your water bill before acting on a specific finding.
Where does Lake Arrowhead get its drinking water?
Surface water (primary source of record in EPA SDWIS).
Are PFAS "forever chemicals" in Lake Arrowhead's water?
Yes. In EPA's UCMR 5 testing (2023-02-07 to 2024-07-10), PFOA was measured at 14 ng/L against a 4 ng/L federal limit and PFOS was measured at 7.2 ng/L against a 4 ng/L federal limit. PFHxA (6.7 ng/L, below the 400,000 ng/L state limit), PFHxS (3.3 ng/L, below the 10 ng/L federal limit) and PFNA (4.6 ng/L, below the 10 ng/L federal limit) were also detected. PFDA (3.9 ng/L), PFHpA (5.7 ng/L) and PFPeA (4.5 ng/L) were also detected; they have 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 Lake Arrowhead's tap water?
Lead is not in Lake Arrowhead's current published record. Lead usually enters from a building's own pipes and fixtures, so a certified home test is the way to know yours.
What does the latest Lake Arrowhead water report show?
PurityMap's current record for Lake Arrowhead holds 31 findings: 2 above a reference, 3 detected within the reference, 3 detected with no limit and 23 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.
Follow this water
Follow Lake Arrowhead's water
One email when a new sampling round is published, a result moves above or below its reference, or the system's score changes.
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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 |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 14 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorooctanesulfonic acid (PFOS) | 7.2 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorononanoic acid (PFNA) | 4.6 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorohexanesulfonic acid (PFHxS) | 3.3 ng/L | 10 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorohexanoic acid (PFHxA) | 6.7 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorodecanoic acid (PFDA) | 3.9 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoroheptanoic acid (PFHpA) | 5.7 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoropentanoic acid (PFPeA) | 4.5 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
23 other contaminants 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Lead (90th percentile) | Non-Detect (ND) | 15 µg/L federal action level | Not detected above the reporting limit | 2024–2026 monitoring period (still open) | Lead & Copper Rule 90th-percentile: LAKE ARROWHEAD CSD (CA3610005) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-02-07 to 2024-03-06 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-03-06 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-03-06 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| 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 | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-03-06 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-03-06 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-07 to 2024-07-10 | UCMR5 Analytical Results: LAKE ARROWHEAD CSD (CA3610005) |
- Result
- 14 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Status
- Above a historical reference; current applicability unverified
- Sampled
- 2023-02-07 to 2024-07-10
Perfluorooctanesulfonic acid (PFOS)
- Result
- 7.2 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Status
- Above a historical reference; current applicability unverified
- Sampled
- 2023-02-07 to 2024-07-10
- Result
- 4.6 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Status
- Within a historical reference; current applicability unverified
- Sampled
- 2023-02-07 to 2024-07-10
Perfluorohexanesulfonic acid (PFHxS)
- Result
- 3.3 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Status
- Within a historical reference; current applicability unverified
- Sampled
- 2023-02-07 to 2024-07-10
Perfluorohexanoic acid (PFHxA)
- Result
- 6.7 ng/L
- Benchmark
- 400,000 ng/L Michigan EGLE state MCL (strictest US state)
- Status
- Within a historical reference; current applicability unverified
- Sampled
- 2023-02-07 to 2024-07-10
- Result
- 3.9 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Detected, no limit
- Sampled
- 2023-02-07 to 2024-07-10
Perfluoroheptanoic acid (PFHpA)
- Result
- 5.7 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Detected, no limit
- Sampled
- 2023-02-07 to 2024-07-10
Perfluoropentanoic acid (PFPeA)
- Result
- 4.5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Detected, no limit
- Sampled
- 2023-02-07 to 2024-07-10
23 other contaminants 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
- 2023-02-07 to 2024-07-10
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
- 2023-02-07 to 2024-07-10
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
- 2023-02-07 to 2024-07-10
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
- 2023-02-07 to 2024-07-10
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
- 2023-02-07 to 2024-07-10
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
- 2023-02-07 to 2024-07-10
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
- 2023-02-07 to 2024-07-10
- Result
- Non-Detect (ND)
- Benchmark
- 15 µg/L federal action level
- Status
- Not detected above the reporting limit
- Sampled
- 2024–2026 monitoring period (still open)
- Result
- < 9 µg/L
- Benchmark
- 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit
- Status
- Not detected above the reporting limit
- Sampled
- 2023-02-07 to 2024-03-06
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
- 2023-02-07 to 2024-03-06
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
- 2023-02-07 to 2024-03-06
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
- 2023-02-07 to 2024-07-10
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
- 2023-02-07 to 2024-07-10
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
- 2023-02-07 to 2024-07-10
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
- 2023-02-07 to 2024-07-10
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
- 2023-02-07 to 2024-07-10
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-02-07 to 2024-07-10
Perfluorododecanoic acid (PFDoA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-02-07 to 2024-07-10
Perfluoroheptanesulfonic acid (PFHpS)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-02-07 to 2024-07-10
Perfluoropentanesulfonic acid (PFPeS)
- Result
- < 4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-02-07 to 2024-07-10
Perfluorotetradecanoic acid (PFTA)
- Result
- < 8 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-02-07 to 2024-03-06
Perfluorotridecanoic acid (PFTrDA)
- Result
- < 7 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-02-07 to 2024-03-06
Perfluoroundecanoic acid (PFUnA)
- Result
- < 2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-02-07 to 2024-07-10
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: LAKE ARROWHEAD CSD (CA3610005)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: LAKE ARROWHEAD CSD (CA3610005)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Something off with your water's smell, color or taste?
Start with the hot-or-cold tap check. Where Lake Arrowhead CSD reported something related, it's shown below.
- Rotten-egg smell
- Cloudy or milky water
- Chlorine smell
- Brown or yellow water
- Metallic taste
Lead at Lake Arrowhead CSD: not detected (90th percentile, 2024–2026 monitoring period (still open)). Lead has no taste, so a taste neither shows nor rules it out.
ZIP codes in Lake Arrowhead
A ZIP code is a postal area, not a water service area. Your water bill names your supplier.