ZipCheckup grade for 93402: C.
A mixed picture - some signals here are worth your attention.
Your top priority: have older plumbing checked for lead solder. Check your ZIP → EPA: reduce lead
Los Osos, CA (93402): PFAS Above 2029 MCL Level - 67/100
EPA data combined for 3 water systems mapped to this ZIP (largest mapped system: Los Osos Community Services District)
EPA records for the water systems mapped to 93402 in Los Osos, 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 of 0.0011 mg/L is below the EPA action level for water systems; EPA's health goal for lead is zero.
- PFAS At least one PFAS result is above an EPA MCL value (UCMR5 sampling; MCL compliance required from 2029).
- Radon EPA Zone 2 - county-level radon potential, not a home measurement.
- Flood 14 cumulative NFIP claim records. Claim evidence is historical, not current map coverage.
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This report sorts findings for 93402 in Los Osos into tiers using its own criteria, covering a water system's 90th-percentile lead result above the EPA action level, unresolved violations on record, PFAS and carbon monoxide risk; in the available data, one finding meets the critical criteria and none meets the high-priority criteria, and the card below links to the section with details.
Score Breakdown
Overall Home Safety Score: 67/100
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 (8) HIGH
Your Water System
ZIP code 93402 in Los Osos, California is mapped to the water system Los Osos Community Services District (EPA ID: CA4010016). This system provides water to approximately 7,086 people from groundwater sources.
There are 3 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| Los Osos Community Services District | CA4010016 | 7,086 | Groundwater |
| Golden State Water Company - Los Osos | CA4010017 | 5,924 | Groundwater |
| S & T Mutual Water Company | CA4000523 | 591 | 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
- 93412 (Los Osos) - <1 mi
- 93443 (Morro Bay) - 3 mi
- 93442 (Morro Bay) - 4 mi - 1 violation recorded for mapped water systems
- 93423 (Atascadero) - 8 mi
- 93405 (San Luis Obispo) - 9 mi
- 93430 (Cayucos) - 9 mi
- 93403 (San Luis Obispo) - 10 mi
- 93406 (San Luis Obispo) - 10 mi
- 93407 (San Luis Obispo) - 10 mi
- 93408 (San Luis Obispo) - 10 mi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Los Osos Community Services District (CA4010016) 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 93402. One or more compound results are above the level of a federal PFAS MCL with compliance required from 2029.
Detected compounds: PFBS, PFPeA, PFHxA, PFOA, PFOS, PFHxS, PFBA, PFHpA.
Highest measured level: 0.018 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 (11) MODERATE
Home & Infrastructure (6) OK
Cost & Community (9) HIGH
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Protect Your Home in Los Osos
Based on local data for ZIP 93402, these services may benefit homeowners in your area.
Based on local data for your area. Use the tools below to explore your options.
Home & Flood Insurance
The ZIP code for this report in Los Osos has 14 FEMA flood claims on record. Standard homeowner policies don't cover flood damage - make sure you're protected.
Typical cost: Flood insurance: premiums vary by property and flood zone; request a quote
Check Your Flood Zone (Free)FEMA flood map lookup - see if your property is in a flood zone
Free tip: Check your FEMA flood zone at msc.fema.gov (free lookup)
Gutter Installation & Repair
The median home in 93402 was built around 1973. 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 Los Osos is 1973; 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 1973 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 93402 safe to drink?
EPA SDWIS records 0 violations since 2021 across the water systems mapped to ZIP 93402 (primary system: Los Osos Community Services 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 93402's water come from?
The recorded water source for Los Osos Community Services District, a system mapped to ZIP code 93402, is Groundwater. This system serves approximately 7,086 people.
How does Los Osos water compare to the national average?
Los Osos's Home Safety Score ranks lower than 65% of U.S. ZIP codes, and lower than 78% of ZIP codes within California.
How can I get my water tested in Los Osos?
If Los Osos Community Services 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.
Is lead a concern in 93402 tap water?
The Lead and Copper Rule record selected for 93402 reports a 90th-percentile lead result of 0.0011 mg/L for a water system mapped to this ZIP (record date 2026-12-31). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.
What is the radon risk for 93402?
93402 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in San Luis Obispo 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 93402's water?
Yes, PFAS have been detected in samples from water systems mapped to 93402. 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.
What does the NFIP claim history show for ZIP 93402?
FEMA records contain 14 flood insurance claims filed in ZIP code 93402; the recorded rated-zone value (the most frequent one if there are several claims) is C, which is claims evidence and may differ from the current FEMA map zone for a property. Claim records do not establish current property risk. Review FEMA's map for the specific property.
How to cite this page
ZipCheckup. (2026). Los Osos, CA (93402): PFAS Above 2029 MCL Level - 67/100. https://zipcheckup.com/report/93402/
@misc{zipcheckup-report-93402,
author = {{ZipCheckup}},
title = {{Los Osos, CA (93402): PFAS Above 2029 MCL Level - 67/100}},
year = {2026},
url = {https://zipcheckup.com/report/93402/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 93402
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 93412 | Los Osos, CA | <1 mi | N/A | 0 |
| 93443 | Morro Bay, CA | 3.5 mi | N/A | 0 |
| 93442 | Morro Bay, CA | 4.4 mi | B | 1 |
| 93423 | Atascadero, CA | 8.5 mi | N/A | 0 |
| 93405 | San Luis Obispo, CA | 8.8 mi | B | 0 |
| 93430 | Cayucos, CA | 9.4 mi | N/A | 0 |
| 93403 | San Luis Obispo, CA | 10.1 mi | N/A | 0 |
| 93406 | San Luis Obispo, CA | 10.1 mi | N/A | 0 |
| 93407 | San Luis Obispo, CA | 10.1 mi | N/A | 0 |
| 93408 | San Luis Obispo, CA | 10.1 mi | N/A | 0 |
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