Los Osos Community Services District
Drinking water quality, contact, and Consumer Confidence Report
Serving 1 city in CA · PWSID CA4010016
Los Osos Community Services District serves 7,086 people. PFAS detected above health guidelines (Perfluorooctanesulfonic acid, Perfluorooctanoic acid) — full contaminant breakdown below.
- People served
- 7,086
- PFAS
- Detected (2 compounds)
- Health-based violations since 2020
- 0
Data sources: EPA SDWIS, Los Osos Community Services District's published Consumer Confidence Report, and compliance monitoring reported to EPA by CA State Water Resources Control Board, Div. of Drinking Water.
This page summarizes publicly available EPA and CCR records. For health decisions about your water, consult your utility or a licensed professional.
Official Los Osos Community Services District Resources
Los Osos Community Services District Service Area
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This map shows the approximate service area for Los Osos Community Services District. Actual coverage may vary. Contact the utility directly to confirm service availability at your address.
Los Osos Community Services District Water Quality Grade
Not graded: Monitor
Los Osos Community Services District reads Monitor. A letter grade is given only beside a Safe verdict.
Is Los Osos Community Services District Water Safe to Drink?
Los Osos Community Services District has reported 2 contaminants above EPA health-based guidelines (MCLGs) in at least one city served. We recommend reviewing individual city reports below for specific water quality details.
Partial data: State Water Board lab results show 2 of the 7 active sources Los Osos Community Services District sampled above California's hexavalent chromium limit of 10 µg/L (state MCL, in effect since October 1, 2024). The highest average is 14.9 µg/L at 8TH STREET UPPER AQUIFER WELL (8 samples since October 1, 2024, latest May 4, 2026). Los Osos Community Services District's treated or delivered water was not sampled, and its other sources average within it, so these results do not show the water it serves above the limit, and they are not counted toward its verdict. Source: State Water Resources Control Board lab results (updated 2026-09-15).
This utility serves 7,086 people across 1 city in CA. Water quality can vary by location within the service area. Check individual city pages below for detailed contaminant data specific to your area.
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Learn more about the contaminants detected in Los Osos Community Services District:
Los Osos Community Services District Service Area
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Los Osos Community Services District Contact & Information
Phone
Mailing Address
B2B Contact Data
B2B Contact Data Available
Contacts for Los Osos Community Services District
| Name | Title | Phone | |
|---|---|---|---|
| J████ S████ | Water Treatment Supervisor | (555) ███-████ | j████@city████.gov |
| M████ J██████ | Utility Director | (555) ███-████ | m████@water████.org |
Water Sources & Treatment
Water Sources
Treatment Methods
Disinfectant Used
hypochlorite
Los Osos Community Services District Consumer Confidence Report
A Consumer Confidence Report (CCR) is the EPA-mandated annual water-quality report every community water system must publish by July 1 each year (Safe Drinking Water Act §1414(c)(4)). It summarizes contaminants tested, MCL and MCLG comparisons, and any system violations from the prior calendar year.
A current CCR for Los Osos Community Services District has not been published or validated on TapWaterData yet.
Residents: contact the utility directly using the phone number above, or check the EPA’s national CCR portal. Reports are typically distributed by mail or posted on the utility’s official website.
Los Osos Community Services District Annual Water Quality Reports
Historical reports are being compiled. Check back soon for archived water quality data.
What is a CCR? The Consumer Confidence Report (CCR) is an annual water quality report that water utilities are required by the EPA to provide to customers. It contains information about your water source, detected contaminants, and compliance status.
EPA Health-Based Violations Since 2020
Los Osos Community Services District has no health-based EPA violation since 2020 (EPA data as of Q2 2026).
EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Concerned about what's in your water?
You're viewing 2 contaminants above health-based guidelines here. Your own tap water can differ — upload your test (PDF or a photo) and we'll email a full plain-English reading of every number, free.
Your upload also helps us keep local water data accurate — we only ever share anonymized, area-level summaries.
Upload my testRecommended Water Filters for Los Osos Community Services District
Based on water quality data from cities served by Los Osos Community Services District, we recommend NSF-certified filters that can remove contaminants above health guidelines.
Filter guides for the contaminants detected here:
Frequently Asked Questions about Los Osos Community Services District
Is Los Osos Community Services District water safe to drink?
Does Los Osos Community Services District have PFAS in its water?
How do I pay my Los Osos Community Services District water bill?
How many people does Los Osos Community Services District serve?
What cities does Los Osos Community Services District serve?
Does Los Osos Community Services District have any EPA violations?
What is Los Osos Community Services District's phone number?
Where can I find Los Osos Community Services District's Consumer Confidence Report?
Similar water utilities in California
How we built this page
Water-quality and contact data on this page comes from public federal and state records. We update each utility's record whenever its underlying source publishes new data — typically within days of an EPA SDWIS refresh.
- Contaminants & violations: EPA Safe Drinking Water Information System (SDWIS) plus the Unregulated Contaminant Monitoring Rule (UCMR-5) for PFAS and emerging contaminants.
- Annual reports: Los Osos Community Services District's most recent published Consumer Confidence Report (CCR), where available.
- Service area & contact: EPA SDWIS. The compliance records it holds for this system are reported to EPA by CA State Water Resources Control Board, Div. of Drinking Water, the state's drinking-water primacy agency.
Spotted a data issue? Use the Spotted something off? link at the bottom of the page — corrections feed back into the next data refresh. Learn more about TapWaterData.
Are you Los Osos Community Services District? Publish your 2027 CCR
TapWaterData runs a free CCR publishing service for community water systems. Claim this listing to publish your Consumer Confidence Report here — it inherits this page's search authority and reaches every customer who Googles Los Osos Community Services District.
- EPA-compliant distribution. Satisfies the 2027 Revised CCR Rule direct-URL requirement with an auditable archive.
- Publish once a year. Agent-assisted workflow; no login setup for small systems.
- Inherits this page's reach. Your published CCR appears directly on the page customers already find on Google.
Free for operators. No card required. Typical setup: 5 minutes.
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This form corrects our data; it does not reach Los Osos Community Services District. For a problem with your water now (discolored water, no water, low pressure, a leak), contact Los Osos Community Services District directly.
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