Screening: quick check, not lab-grade
WeAQUA DoubleCheck Water Hardness Test Strips (200)
WeAQUA
Total water hardness
- Turnaround: About 1 minute
What it can't tell you: It measures hardness only, so it tells you nothing about lead, PFAS or bacteria.
City water report · 2026
Is Stockton Tap Water Safe to Drink?
Short answer: In the records we hold for Stockton, two PFAS, PFOA and PFOS, each had a sample above a 2024 EPA limit (not a violation: the limits are judged on a yearly average, due 2029), and a health-based violation is on record (EPA SDWIS). Also worth knowing: the water is hard. 4 substances were detected and 28 were tested and not detected. The water is from City of Stockton, serving 192,702 residents.
- Year 2026
- Utility City of Stockton
- Coverage 32 records
- Updated 2026-10-15
Water utility
Where Stockton’s water comes from
- Utility
- City of Stockton
- Water system
- CITY OF STOCKTON · CA3910012
- Source water
- Surface water
- Disinfectant
- not on record
- Population served
- 192,702
- Reporting period
- Sampled 2023–2027
- Monitoring coverage
- 32 records · 3 of 4 groups measured
- Your water utility
- City of Stockton: contact and record
Likely match, check your bill
2 water systems report serving Stockton. This report uses the largest, CITY OF STOCKTON. Your water bill names your actual supplier. Source: EPA SDWIS 2026Q2.
- CITY OF STOCKTONThis reportCA3910012 · 192,702 served
- CDCR CALIFORNIA HEALTH CARE FACILITYCA3910803 · 2,186 served · EPA record for CDCR CALIFORNIA HEALTH CARE FACILITY (opens in a new tab)
Why this matters
- 1Source
Surface water
- 2Treatment
The treatment details are not on record.
- 3Distribution
Mains, then your building’s service line.
- 4Your tap
Plumbing inside the building is outside this record.
At a glance
Stockton water in four numbers
Purity ScoreCITY OF STOCKTON · PWSID CA3910012
4Detected3 above a reference
3Above a referenceof 32 records
1Health-based violationslast 10 years · EPA SDWIS
Two PFAS, PFOA and PFOS, each had a sample above a 2024 EPA limit (not a violation: the limits are judged on a yearly average, due 2029); the water is hard.
What we found
4 detected results, by distance from their limit
Each bar runs to the named reference; the tick marks it. Open a row for five layers: measured, compared, meaning, where it matters, what to do.Perfluorooctanesulfonic acid (PFOS)Above EPA's 2024 limit (one sample) · Federal MCL4.0 ng/L federal MCL (2024)28ng/L
① · Measured
28 ng/L, sampled 2023-02-28 to 2025-12-02. EPA UCMR 5.
② · Compared
4.0 ng/L federal MCL (2024): a legal limit. That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. EPA health goal (MCLG): 0.
③ · Meaning
One EPA sample measured 28 ng/L, above the 4 ng/L limit EPA set in 2024. That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation.
④ · Where it matters
Comes with the source water; home plumbing does not add it.
⑤ · What to do
See the evidence record →Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58 (PFOA/PFOS)).
Perfluorooctanoic acid (PFOA)Above EPA's 2024 limit (one sample) · Federal MCL4.0 ng/L federal MCL (2024)6.7ng/L
① · Measured
6.7 ng/L, sampled 2023-02-28 to 2025-12-02. EPA UCMR 5.
② · Compared
4.0 ng/L federal MCL (2024): a legal limit. That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. EPA health goal (MCLG): 0.
③ · Meaning
One EPA sample measured 6.7 ng/L, above the 4 ng/L limit EPA set in 2024. That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation.
④ · Where it matters
Comes with the source water; home plumbing does not add it.
⑤ · What to do
See the evidence record →Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58 (PFOA/PFOS)).
Perfluorobutanesulfonic acid (PFBS)Within reference · Screening level2,000 ng/L EPA health advisory (screening, not a legal limit)6.2ng/L
① · Measured
6.2 ng/L, sampled 2023-02-28 to 2025-12-02. EPA UCMR 5.
② · Compared
2,000 ng/L EPA health advisory (screening, not a legal limit).
③ · Meaning
Detected at up to 6.2 ng/L (below the 2,000 ng/L EPA health advisory; a screening level, not a legal limit).
④ · Where it matters
Comes with the source water; home plumbing does not add it.
⑤ · What to do
See the evidence record →Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58, with PFBS named on the listing).
Water hardnessAbove aesthetic · Aesthetic, no health limitAesthetic, no federal health limit8.6gpg
① · Measured
8.6 gpg, sampled 2025. Utility CCR.
② · Compared
Aesthetic, no federal health limit.
③ · Meaning
53–242 mg/L as CaCO3 (3.1–14.2 grains/gal) across the system; hard at the midpoint (148 mg/L). Aesthetic (scale/appliances), not a health finding.
④ · Where it matters
Shows up as scale in kettles, water heaters and fixtures.
⑤ · What to do
See the evidence record →Test your own tap first. To reduce it: Ion-exchange water softener (NSF/ANSI 44 (softeners)).
28 others tested, none detectedshow
- 11Cl-PF3OUdS
- 8:2 FTS
- 4:2 FTS
- 6:2 FTS
- ADONA
- 9Cl-PF3ONS
- HFPO-DA (GenX)
- Lead (90th percentile)
- Lithium
- NEtFOSAA
- NMeFOSAA
- NFDHA
- PFEESA
- PFMPA
- PFMBA
- PFBA
- PFDA
- PFDoA
- PFHpS
- PFHpA
- PFHxS
- PFHxA
- PFNA
- PFPeS
- PFPeA
- PFTA
- PFTrDA
- PFUnA
CITY OF STOCKTON (EPA PWSID CA3910012) delivers surface water to 192,702 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. The utility's 2025 CCR reports hard water.
Track record
1health-based violation in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score. All 2 EPA filings are listed below.
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.
Health-based violations, last 10 years
Every filing is listed; the Track record score counts at most one per contaminant per year.
- TTHM
Resolved
- TTHMMCL
to Resolved
- TTHMMCL
to Resolved
Your household
Your tap can differ from the city record
The record describes water leaving treatment and samples across the system. Pipes, solder and fixtures inside a building can add lead the record can’t see, especially in older buildings with lead service lines.
Test your water- CityTreated water
Measured in this report
- MainsDistribution network
Sampled across the system
- BuildingService line and plumbing
Not in this record
- TapYour glass
Only a tap test measures it
Test first, then treat
Three steps from a record to your glass
- 01Test
Know what comes from your tap, starting with a first-draw lead sample.
- 02Match
Compare each result with its named reference in our test reader.
- 03Treat
Choose a technology certified for what your test found.
Commercial
Test kits
Affiliate linksAs an Amazon Associate, PurityMap earns from qualifying purchases.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.
When your results arrive, read them here → · Compare every kit we list
Treatment matching
What can reduce what was found here
Finding → technology → certification → product, in that order. The reference type carries the meaning; there is no severity score.| Finding | Reference type | Technology | Certification to check |
|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS)28 ng/L | Federal MCL | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58 (PFOA/PFOS) |
| Perfluorooctanoic acid (PFOA)6.7 ng/L | Federal MCL | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58 (PFOA/PFOS) |
| Perfluorobutanesulfonic acid (PFBS)6.2 ng/L | Screening level | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58, with PFBS named on the listing |
| Water hardness8.6 gpg | Aesthetic, no health limit | Ion-exchange water softener | NSF/ANSI 44 (softeners) |
Commercial
Filters for the PFAS found in Stockton water
Affiliate linksPurityMap earns a commission from these links. "Best choice" and "Budget pick" go to certified products first; commission never decides them. As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure★ Best choice: Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200), certified for PFOA and PFOS.
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| ★ Best choice | Under-sinkAquasana Claryum 2-Stage Under-Sink Filter (AQ-5200) | TreatsPFOA and PFOSPrice$$ | Certified for PFOA and PFOS (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names PFOA and PFOS, found in Stockton’s record.See the evidence | Check price on Amazon |
| Also good | Under-sinkAquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M) | TreatsPFOA and PFOSPrice$$ | Certified for PFOA and PFOS (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names PFOA and PFOS, found in Stockton’s record.See the evidence | Check price at Aquasana |
| Also good | CountertopAquasana Clean Water Machine Countertop Filter (AQ-CWM2) | TreatsPFOA and PFOSPrice$$ | Certified for PFOA and PFOS (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names PFOA and PFOS, found in Stockton’s record.See the evidence | Check price at Aquasana |
See all 12 drinking-water options for PFAS
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| Also good | Reverse osmosisSmartFlow® Reverse Osmosis | TreatsPFOA and PFOSTechnologyReverse osmosisPrice$$$ | Certified for PFOA and PFOS (NSF/ANSI 53 (includes P473), WQA) | Why it’s listed: its current certification names PFOA and PFOS, found in Stockton’s record.See the evidence | Check price at Aquasana |
| Also good | Under-sinkWaterdrop G3P600 Tankless Reverse-Osmosis System | TreatsPFOA and PFOSPrice$$$ | Certified for PFOA and PFOS (NSF/ANSI 53, IAPMO) | Why it’s listed: its current certification names PFOA and PFOS, found in Stockton’s record.See the evidence | Check price at Waterdrop |
| Also good | Under-sinkWaterdrop G3P800 Tankless Reverse-Osmosis System | TreatsPFOA and PFOSPrice$$$ | Certified for PFOA and PFOS (NSF/ANSI 53, IAPMO) | Why it’s listed: its current certification names PFOA and PFOS, found in Stockton’s record.See the evidence | Check price at Waterdrop |
| Also good | CountertopAquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100) | TreatsPFOA and PFOSPrice$$$ | Certified for PFOA and PFOS (NSF/ANSI 53, IAPMO) | Why it’s listed: its current certification names PFOA and PFOS, found in Stockton’s record.See the evidence | Check price on Amazon |
| Also good | CountertopAquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000) | TreatsPFOA and PFOSPrice$$$ | Certified for PFOA and PFOS (NSF/ANSI 53, IAPMO) | Why it’s listed: its current certification names PFOA and PFOS, found in Stockton’s record.See the evidence | Check price on Amazon |
| Also good | CountertopPatriot Pure Ultimate Water Filtration System | TreatsPFOA and PFOSPrice$$ | Certified for PFOA and PFOS (NSF/ANSI 53, NSF, IAPMO) | Why it’s listed: its current certification names PFOA and PFOS, found in Stockton’s record.See the evidence | Check price on Amazon |
| Also good | Reverse osmosisiSpring RCC7AK Alkaline Reverse Osmosis SystemUse code REFISPRING at checkout: 10% off your first iSpring order. | TechnologyReverse osmosisPrice$$ | Brand lab-tested for PFAS, not independently certified for PFOA, PFOS and Perfluorobutanesulfonic acid (PFBS) | See the evidence | Check price at iSpring |
| Also good | Reverse osmosisiSpring RO5004F Tankless Reverse Osmosis System with UVUse code REFISPRING at checkout: 10% off your first iSpring order. | TechnologyReverse osmosisPrice$$$ | Brand lab-tested for PFAS, not independently certified for PFOA, PFOS and Perfluorobutanesulfonic acid (PFBS) | See the evidence | Check price at iSpring |
| Also good | Reverse osmosisWaterdrop X12 Reverse Osmosis System | TechnologyReverse osmosisPrice$$$$ | Brand lab-tested for PFAS, not independently certified for PFOA, PFOS and Perfluorobutanesulfonic acid (PFBS) | See the evidence | Check price at Waterdrop |
★ Best choice: HealthShield™, certified for PFOA and PFOS.
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| ★ Best choice | Whole-houseHealthShield™ | TreatsPFOA and PFOSPrice$$$$ | Certified for PFOA and PFOS (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names PFOA and PFOS, found in Stockton’s record.See the evidence | Check price at Aquasana |
| $ Budget pick | Whole-houseiSpring WGB32B-PFKS PFAS & Heavy Metals Whole House FilterUse code REFISPRING at checkout: 10% off your first iSpring order. | Price$$$ | Brand lab-tested for PFAS, not independently certified for PFOA, PFOS and Perfluorobutanesulfonic acid (PFBS) | See the evidence | Check price at iSpring |
Also: hard water picks →
PurityMap earns a commission from these links. "Best choice" and "Budget pick" go to certified products first; commission never decides them. As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Local help
Tired of hard-water buildup?
A local plumber can look at your home and install a water softener or whole-home system.
Is this right for my home?
Choose your situation
Your path: I live in an older buildingLead from plumbing is the main question
Older buildings may have lead service lines, solder or fixtures. Lead is not in Stockton’s published record, so only a tap test tells you. Test first-draw water, then filter if needed.
Look forLead reduction: NSF/ANSI 53 (lead)
How to test your tap →Your path: I care about PFASCheck what was tested
3 of 29 PFAS tested were detected in Stockton’s record (PFOS 28 ng/L, PFOA 6.7 ng/L and PFBS 6.2 ng/L); 2 above their limit. If PFAS matters to you, a filter certification names each compound it covers.
Look forNSF/ANSI 53 or 58, with each compound you care about named on the listing
PFAS in Stockton →Your path: My water tastes of chlorineThe disinfectant is not in this record
Most utilities keep chlorine or chloramine in the pipes. A carbon filter certified for taste and odor reduces either; your utility can tell you which it uses.
Look forNSF/ANSI 42 (chlorine taste and odor)
Water treatment technologies →Your path: I have scale or hard waterStockton water is hard (8.6 gpg)
Scale is a comfort and appliance issue, not a health one.
Look forSoftener: NSF/ANSI 44 (softeners)
Hard water in Stockton →Your path: I want the broadest reductionReverse osmosis at one tap
Reverse osmosis reduces many dissolved contaminants, including lead and minerals, at a single faucet, with some water sent to drain.
Look forNSF/ANSI 58
Compare treatments →Questions
Stockton tap water FAQ
Follow Stockton’s water
Get one email when Stockton’s record changes.
One email when a new sampling round is published, a result moves above or below its reference, or the system's score changes.Is Stockton tap water safe to drink?
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Stockton, PFOS 28 ng/L and PFOA 6.7 ng/L were measured in one EPA sample each, above the 4 ng/L limit EPA set in 2024 (not a violation: the limits are judged on a yearly average, due 2029). CITY OF STOCKTON (PWSID CA3910012) has a Purity Score of 56/100 (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. What we found →
Who provides tap water in Stockton?
CITY OF STOCKTON (PWS ID CA3910012) is the public water system on record for Stockton, California, serving about 192,702 people. Confirm the utility on your water bill before acting on a specific finding. Water utility →
Where does Stockton get its drinking water?
Surface water (primary source of record in EPA SDWIS). Water utility →
Are PFAS "forever chemicals" in Stockton's water?
Yes. In EPA's UCMR 5 testing (2023-02-28 to 2025-12-02), PFOS was measured at 28 ng/L in one EPA sample, above the 4 ng/L limit EPA set in 2024 and PFOA was measured at 6.7 ng/L in one EPA sample, above the 4 ng/L limit EPA set in 2024. EPA's 2024 limits are judged on a yearly average, and water systems have until 2029 to meet them, so a single sample is not a violation. PFBS (6.2 ng/L, below the 2,000 ng/L EPA health advisory) was also detected. Reverse osmosis and filters certified to NSF/ANSI 53 for PFOA/PFOS reduce them at the tap. What we found →
Is there lead in Stockton's tap water?
Lead is not in Stockton'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. Your household →
What does the latest Stockton water report show?
PurityMap's current record for Stockton holds 32 findings: 3 above a reference, 1 detected within the reference and 28 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass. Records →
Is Stockton's water hard?
Stockton's water is recorded as 8.6 gpg, hard. Hardness is an aesthetic and plumbing characteristic, not a health-based limit. Choose your situation →
Data and sources
32 records, each traceable
- EPA UCMR 5
- EPA SDWIS (Lead & Copper Rule)
- Utility CCR
| Contaminant | Measured | Reference | Sampled | Source |
|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 28 ng/L | 4.0 ng/L federal MCL (2024) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorooctanoic acid (PFOA) | 6.7 ng/L | 4.0 ng/L federal MCL (2024) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Water hardness | 8.6 gpg | Aesthetic, no federal health limit | 2025 | Utility CCR ↗ (opens in a new tab) |
| Perfluorobutanesulfonic acid (PFBS) | 6.2 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L (not detected) | 10 ng/L federal MCL (2024) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Lead (90th percentile) | Not detected | 15 µg/L federal action level | 2025–2027 | EPA SDWIS (Lead & Copper Rule) ↗ (opens in a new tab) |
| Lithium | < 9 µg/L (not detected) | 10 µg/L EPA health reference level (screening, not a legal limit) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L (not detected) | 10 ng/L federal MCL (2024) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L (not detected) | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L (not detected) | 10 ng/L federal MCL (2024) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
UCMR5 Analytical Results
UCMR5 Analytical Results: CITY OF STOCKTON (CA3910012)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: CITY OF STOCKTON (CA3910012)
US EPA SDWIS
Consumer Confidence Report (CCR)
City of Stockton Municipal Utilities Department 2025 Consumer Confidence Report (CCR)
City of Stockton Municipal Utilities Department
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Methodology
How PurityMap reads Stockton’s water
- 01Source data
EPA SDWIS, EPA UCMR 5 and utility reports, each dated and linked.
- 02Normalize
Units converted to one basis; a non-detect kept distinct from zero.
- 03Classify
Each result tagged by reference type: MCL, action level, screening level or aesthetic.
- 04Compare to the named reference
Every value sits against its own reference, never a blended one.
- 05Score
Measured subjects summarised at the water-system level; an open health-based violation caps the score.
- 06Match treatment
Treatment is matched to what was found; a product is called certified only when its current certification names it.
What the Purity Score means: a summary of this water system’s published record, capped while a health-based violation is open. It is not a test of any tap. CITY OF STOCKTON · PWSID CA3910012 · Purity Score 56/100 (Fair) · Confidence: moderate · Assessed at the water-system level
Full methodology →Something off with your water's smell, color or taste?
Start with the hot-or-cold tap check. Where City of Stockton reported something related, it's shown below.
- Rotten-egg smell
- Cloudy or milky water
- Chlorine smell
- Brown or yellow water
- Metallic taste
Lead at City of Stockton: not detected (90th percentile, 2025–2027 monitoring period (still open)). Lead has no taste, so a taste neither shows nor rules it out.