ZipCheckup grade for 95366: B.
The model grade is high, but the records on this page include findings worth reviewing.
Your top priority: use a filter certified to reduce PFAS; check which ones. Check your ZIP → EPA PFAS info
Ripon, CA (95366): PFAS Above 2029 MCL Level - 83/100
EPA data combined for 4 water systems mapped to this ZIP (largest mapped system: South San Joaquin Irrigation District)
EPA records for the water systems mapped to 95366 in Ripon, CA contain 1 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 0 are marked health-based.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water EPA records for water systems mapped to this ZIP show 1 violation (non-health) (since 2021).
- PFAS At least one PFAS result is above an EPA MCL value (UCMR5 sampling; MCL compliance required from 2029).
- Radon EPA Zone 3 - county-level radon potential, not evidence of a low home result.
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One critical finding sits on record for Ripon (95366), unaccompanied by high-priority items.
Score Breakdown
Overall Home Safety Score: 83/100
This is the published model score. Component and domain values are shown independently; they are not added together on this page.
Canonical components
Required domains
Coverage: 4 of 4 components and 3 of 3 domains observed.
Model 4.0.0; series home-safety-v4-cross-vertical.
Safety & Health (7) HIGH
Your Water System
ZIP code 95366 in Ripon, California is mapped to the water system South San Joaquin Irrigation District (EPA ID: CA5010040). This system provides water to approximately 25 people from surface water sources.
There are 4 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| South San Joaquin Irrigation District | CA5010040 | 25 | Surface water |
| City of Ripon, | CA3910007 | 15,741 | Groundwater |
| City of Manteca, | CA3910005 | 84,928 | Surface water |
| Spring Creek Estates Public Water System | CA3900927 | 119 | Groundwater |
Other Water Quality Reports in California
- 90001 (Los Angeles)
- 90002 (Los Angeles)
- 90003 (Los Angeles)
- 90004 (Los Angeles)
- 90005 (Los Angeles)
- 90006 (Los Angeles)
- 90007 (Los Angeles)
- 90008 (Los Angeles)
- 90009 (Los Angeles)
- 90010 (Los Angeles)
- 90011 (Los Angeles)
- 90012 (Los Angeles)
- 90013 (Los Angeles)
- 90014 (Los Angeles)
- 90015 (Los Angeles)
- 90016 (Los Angeles)
- 90017 (Los Angeles)
- 90018 (Los Angeles)
- 90019 (Los Angeles)
- 90020 (Los Angeles)
Nearby Water Quality Reports
- 95368 (Salida) - 4 mi
- 95337 (Manteca) - 6 mi - 1 violation recorded for mapped water systems
- 95336 (Manteca) - 6 mi - 5 violations recorded for mapped water systems
- 95356 (Modesto) - 7 mi - 1 violation recorded for mapped water systems
- 95320 (Escalon) - 8 mi
- 95350 (Modesto) - 8 mi
- 95352 (Modesto) - 9 mi
- 95397 (Modesto) - 9 mi
- 95330 (Lathrop) - 10 mi - 1 violation recorded for mapped water systems
- 95358 (Modesto) - 10 mi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for South San Joaquin Irrigation District (CA5010040) on EPA.gov.
3 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.
PFAS Contamination Detected
PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 95366. One or more compound results are above the level of a federal PFAS MCL with compliance required from 2029.
Detected compounds: PFHxS, PFOS, PFHxA, PFOA, PFBS.
Highest measured level: 0.019 µg/L
Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.
Environmental Hazards (10) HIGH
Home & Infrastructure (6) OK
Cost & Community (9) MODERATE
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Frequently Asked Questions
Is the tap water in 95366 safe to drink?
EPA SDWIS records 1 violation since 2021 across the water systems mapped to ZIP 95366 (primary system: South San Joaquin Irrigation District), including 0 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.
Where does 95366's water come from?
The recorded water source for South San Joaquin Irrigation District, a system mapped to ZIP code 95366, is Surface water. This system serves approximately 25 people.
How does Ripon water compare to the national average?
Ripon's Home Safety Score ranks better than 67% of U.S. ZIP codes, and at or above 67% within California.
How can I get my water tested in Ripon?
If South San Joaquin Irrigation District supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.
What is the radon risk for 95366?
95366 is mapped to a county in EPA Radon Zone 3 (low county-level radon potential; EPA recommends testing every home), located in San Joaquin County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.
Are there PFAS (forever chemicals) in 95366's water?
Yes, PFAS have been detected in samples from water systems mapped to 95366. One or more PFAS results are above the level of a federal PFAS MCL with compliance required from 2029. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.
How to cite this page
ZipCheckup. (2026). Ripon, CA (95366): PFAS Above 2029 MCL Level - 83/100. https://zipcheckup.com/report/95366/
@misc{zipcheckup-report-95366,
author = {{ZipCheckup}},
title = {{Ripon, CA (95366): PFAS Above 2029 MCL Level - 83/100}},
year = {2026},
url = {https://zipcheckup.com/report/95366/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 95366
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 95368 | Salida, CA | 3.6 mi | A | 0 |
| 95337 | Manteca, CA | 6.2 mi | B | 1 |
| 95336 | Manteca, CA | 6.4 mi | B | 5 |
| 95356 | Modesto, CA | 6.6 mi | B | 1 |
| 95320 | Escalon, CA | 7.8 mi | A | 0 |
| 95350 | Modesto, CA | 8.2 mi | B | 0 |
| 95352 | Modesto, CA | 8.7 mi | N/A | 0 |
| 95397 | Modesto, CA | 8.7 mi | N/A | 0 |
| 95330 | Lathrop, CA | 9.8 mi | B | 1 |
| 95358 | Modesto, CA | 9.8 mi | B | 0 |
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