MyCleanWater

Stockton, California Water Quality Report

Water quality data for 74 water systems serving 229,978 people.

0
Very Poor
out of 100

Water Source

74
Water Systems
230K
People Served
Surface water, Ground water
Water Source

Detected Contaminants

ContaminantDetected LevelEPA Limit (MCL)Health Guideline% of LimitStatus
PFBS0.009 No federal limit2000.0 ug/L(EPA Health Advisory)
0%
Below guideline
PFHxA0.004 No federal limit1000.0 ug/L(EWG)
0%
Below guideline
PFHxS0.005 0.010 ug/L0.001 ug/L(EWG)
47%
Within limit
PFOA0.008 0.004 ug/L0.090 ug/L(EWG)
208%
Above limit
PFOS0.013 0.004 ug/L0.300 ug/L(EWG)
338%
Above limit
PFPeA0.003 No federal limit1000.0 ug/L(EWG)
0%
Below guideline

Recommended Water Filters

Based on the contaminants detected in your water supply, these filtration systems are recommended:

Reverse Osmosis (RO)

Reverse osmosis systems remove up to 99% of PFAS compounds. Recommended for homes with detected PFAS.

Up to 99% PFAS removal

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Compliance & Violations

Active Violations (42)

4H

Jul 2, 2025

minor

4H

Jul 2, 2025

minor

4H

Jul 2, 2025

minor

4G

Oct 17, 2024

minor

2E

Oct 17, 2024

critical

2E

Oct 17, 2024

critical

4G

Oct 17, 2024

minor

4G

Oct 17, 2024

minor

2E

Oct 17, 2024

critical

52

Oct 1, 2023

moderate

52

Oct 1, 2022

moderate

52

Oct 1, 2021

moderate

52

Oct 1, 2018

moderate

71

Jul 1, 2011

minor

71

Jul 1, 2009

minor

71

Jul 1, 2006

minor

71

Jul 1, 2005

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Violation

Unknown

minor

Resolved Violations (950)

02

Jul 1, 2025 — Sep 30, 2025

critical

1A

Jun 1, 2025 — Jun 30, 2025

critical

75

May 23, 2025

minor

1A

May 1, 2025 — May 31, 2025

critical

02

Apr 1, 2025 — Jun 30, 2025

critical

+ 945 more resolved violations

Frequently Asked Questions

Is Stockton tap water safe to drink?

Stockton's water has 2 contaminants detected above EPA limits. While the water is treated, residents may want to consider additional filtration.

What contaminants are in Stockton tap water?

6 contaminants have been detected in Stockton's water supply across 74 water systems. See the full contaminant table above for details.

How can I improve my water quality in Stockton?

Install a water filter rated for the specific contaminants found in Stockton's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.

Does Stockton have any water quality violations?

Yes, Stockton currently has 111 active violations. See the violations section above for details.