San Marcos, CA (92096): 1 Violation Recorded for Mapped Water Systems
EPA data combined for 2 water systems mapped to this ZIP (largest mapped system: Vallecitos Water District)
EPA records for the water systems mapped to 92096 in San Marcos, 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).
- 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.
- PFAS PFAS detected in UCMR5 sampling; see the PFAS section for each compound, compared with the federal PFAS MCL where one exists.
- Radon EPA Zone 3 - county-level radon potential, not evidence of a low home result.
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In compiled records for 92096 in San Marcos, 1 safety condition carry a high-priority designation - no finding in the same dataset meets the critical-level classification.
Score Breakdown
Overall Home Safety Score: Score unavailable
Required evidence is missing. Missing values remain unknown and are not imputed or renormalized.
Canonical components
Required domains
Coverage: 3 of 4 components and 2 of 3 domains observed.
Model 4.0.0; series home-safety-v4-cross-vertical.
Safety & Health (8) HIGH
Your Water System
ZIP code 92096 in San Marcos, California is mapped to the water system Vallecitos Water District (EPA ID: CA3710002). This system provides water to approximately 113,500 people from surface water sources.
There are 2 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| Vallecitos Water District | CA3710002 | 113,500 | Surface water |
| Rincon Del Diablo Mwd (id-1) | CA3710018 | 30,757 | Surface water |
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
- 92079 (San Marcos) - <1 mi
- 92069 (San Marcos) - <1 mi - 1 violation recorded for mapped water systems
- 92078 (San Marcos) - 2 mi - 1 violation recorded for mapped water systems
- 92026 (Escondido) - 4 mi - 3 violations recorded for mapped water systems
- 92081 (Vista) - 5 mi - 1 violation recorded for mapped water systems
- 92029 (Escondido) - 5 mi - 4 violations recorded for mapped water systems
- 92030 (Escondido) - 5 mi
- 92033 (Escondido) - 5 mi
- 92046 (Escondido) - 5 mi
- 92084 (Vista) - 6 mi - 1 violation recorded for mapped water systems
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Vallecitos Water District (CA3710002) on EPA.gov.
5 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 92096.
Detected compounds: PFBA.
Highest measured level: 0.01 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 (9) CRITICAL
Home & Infrastructure (2) OK
Cost & Community (7) OK
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Protect Your Home in San Marcos
Based on local data for ZIP 92096, these services may benefit homeowners in your area.
Based on local data for your area. Use the tools below to explore your options.
Roofing Inspection & Repair
Active weather alerts in California increase the risk of roof damage from hail and high winds. A professional inspection can identify vulnerabilities.
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 92096 safe to drink?
EPA SDWIS records 1 violation since 2021 across the water systems mapped to ZIP 92096 (primary system: Vallecitos 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 92096's water come from?
The recorded water source for Vallecitos Water District, a system mapped to ZIP code 92096, is Surface water. This system serves approximately 113,500 people.
How can I get my water tested in San Marcos?
If Vallecitos 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 92096?
92096 is mapped to a county in EPA Radon Zone 3 (low county-level radon potential; EPA recommends testing every home), located in San Diego 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 92096's water?
Yes, PFAS have been detected in samples from water systems mapped to 92096. 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). San Marcos, CA (92096): 1 Violation Recorded for Mapped Water Systems. https://zipcheckup.com/report/92096/
@misc{zipcheckup-report-92096,
author = {{ZipCheckup}},
title = {{San Marcos, CA (92096): 1 Violation Recorded for Mapped Water Systems}},
year = {2026},
url = {https://zipcheckup.com/report/92096/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 92096
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 92079 | San Marcos, CA | <1 mi | N/A | 0 |
| 92069 | San Marcos, CA | <1 mi | A | 1 |
| 92078 | San Marcos, CA | 2.0 mi | A | 1 |
| 92026 | Escondido, CA | 4.1 mi | A | 3 |
| 92081 | Vista, CA | 4.5 mi | A | 1 |
| 92029 | Escondido, CA | 4.8 mi | A | 4 |
| 92030 | Escondido, CA | 4.9 mi | N/A | 0 |
| 92033 | Escondido, CA | 4.9 mi | N/A | 0 |
| 92046 | Escondido, CA | 4.9 mi | N/A | 0 |
| 92084 | Vista, CA | 5.9 mi | A | 1 |
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