ZipCheckup grade for 94964: A.
Checked records flag no major concern; missing data is unknown.
San Quentin, CA (94964) Home Safety: 100/100
EPA data for Marin Municipal Water District
EPA records for the water systems mapped to 94964 in San Quentin, CA contain zero recorded violations for inclusive record years 2021 through 2026. This does not establish that every category was monitored or published, and it does not cover events outside that source window.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water No drinking-water violations in EPA records since 2021.
- Lead The reported 90th-percentile lead result is below the laboratory reporting limit, not a measured zero; EPA's health goal for lead is zero.
- Radon EPA Zone 3 - county-level radon potential, not evidence of a low home result.
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Score Breakdown
Overall Home Safety Score: 100/100
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) CRITICAL
Your Water System
ZIP code 94964 in San Quentin, California is mapped to the water system Marin Municipal Water District (EPA ID: CA2110002). This system provides water to approximately 186,895 people from surface water sources.
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
- 94974 (San Quentin) - <1 mi
- 94925 (Corte Madera) - 2 mi
- 94901 (San Rafael) - 2 mi
- 94976 (Corte Madera) - 3 mi
- 94977 (Larkspur) - 3 mi
- 94939 (Larkspur) - 3 mi
- 94904 (Greenbrae) - 3 mi
- 94912 (San Rafael) - 3 mi
- 94913 (San Rafael) - 3 mi
- 94914 (Kentfield) - 4 mi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Marin Municipal Water District (CA2110002) 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.
UCMR 5 PFAS monitoring: no reportable detections in available records
Available federal UCMR5 records for water systems mapped to ZIP code 94964 show no PFAS detections among the compounds tested, at the program's reporting levels.
The EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR5) required community and non-transient non-community water systems serving 3,300 or more people to test for 29 PFAS compounds and lithium between 2023 and 2025. Systems with no detections at the federal minimum reporting level had no results at or above that reporting level.
Environmental Hazards (10) HIGH
Home & Infrastructure (5) MODERATE
Possible home maintenance concerns - talk to a local expert.
Call (855) 384-4856Paid Partner This is a free service. You will be connected with an independent service provider. We may receive compensation.
Cost & Community (6) OK
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Protect Your Home in San Quentin
Based on local data for ZIP 94964, these services may benefit homeowners in your area.
Based on local data for your area. Use the tools below to explore your options.
Gutter Installation & Repair
The median home in 94964 was built around 1957. Aging gutters can cause foundation damage, basement flooding, and mold - a professional assessment can prevent costly repairs.
Typical cost: Gutter installation: typically $1,000–$2,500 for a standard home
Estimate Your Home Maintenance CostsWindow Replacement
The median build year of homes in San Quentin is 1957; check the age and condition of your own windows. ENERGY STAR windows can save $101–$583/year on energy bills.
Typical cost: Window replacement: typically $300–$800 per window installed
Estimate Your Home Maintenance CostsRoofing Inspection & Repair
Homes built around 1957 may be on their second or third roof. A professional inspection can catch damage before leaks start.
Typical cost: Roof inspection: typically $75–$300; repairs $300–$1,500
Estimate Your Home Insurance NeedsService recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.
Frequently Asked Questions
Is the tap water in 94964 safe to drink?
EPA SDWIS records 0 violations since 2021 across the water systems mapped to ZIP 94964 (primary system: Marin Municipal Water 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 94964's water come from?
The recorded water source for Marin Municipal Water District, a system mapped to ZIP code 94964, is Surface water. This system serves approximately 186,895 people.
How does San Quentin water compare to the national average?
San Quentin's Home Safety Score ranks better than 93% of U.S. ZIP codes, and at or above 93% within California.
How can I get my water tested in San Quentin?
If Marin Municipal Water 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 94964?
94964 is mapped to a county in EPA Radon Zone 3 (low county-level radon potential; EPA recommends testing every home), located in Marin County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.
How to cite this page
ZipCheckup. (2026). San Quentin, CA (94964) Home Safety: 100/100. https://zipcheckup.com/report/94964/
@misc{zipcheckup-report-94964,
author = {{ZipCheckup}},
title = {{San Quentin, CA (94964) Home Safety: 100/100}},
year = {2026},
url = {https://zipcheckup.com/report/94964/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 94964
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 94974 | San Quentin, CA | <1 mi | N/A | 0 |
| 94925 | Corte Madera, CA | 2.1 mi | A | 0 |
| 94901 | San Rafael, CA | 2.4 mi | A | 0 |
| 94976 | Corte Madera, CA | 2.6 mi | N/A | 0 |
| 94977 | Larkspur, CA | 2.8 mi | N/A | 0 |
| 94939 | Larkspur, CA | 2.8 mi | A | 0 |
| 94904 | Greenbrae, CA | 2.9 mi | A | 0 |
| 94912 | San Rafael, CA | 3.4 mi | N/A | 0 |
| 94913 | San Rafael, CA | 3.4 mi | N/A | 0 |
| 94914 | Kentfield, CA | 4.0 mi | N/A | 0 |
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