County · California
Mendocino County, California: drinking water records
Explore EPA records for 42 community water systems across 26 ZIP codes in Mendocino County, then find water-testing resources and available recent monitoring-station readings.
Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages
Drinking-water records
EPA survey and compliance records are historical reports. UCMR 5 results are available for 7 of the 42 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems in this county
All 42 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Fort Bragg, City of CA2310001 | 6,919 | 120 | 0 | 1 | 0 ppbbelow the action level |
| Ukiah, City of CA2310003 | 16,607 | 480 | 9 | 0 | 0 ppbbelow the action level |
| Willits, City of CA2310004 | 6,175 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Millview County Water District CA2310006 | 5,500 | 240 | 0 | 0 | 0 ppbbelow the action level |
| Redwood Valley County Water District CA2310008 | 5,200 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Willow County Water District CA2310005 | 3,797 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Brooktrails Township CSD CA2310009 | 3,632 | 120 | 0 | 0 | 0 ppbbelow the action level |
| Rogina Water Company INC. CA2310002 | 2,554 | 0 | 0 | 1 | 0 ppbbelow the action level |
| City of 10,000 Buddhas CA2300731 | 400 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Elk County Water District CA2300514 | 380 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Woodside RV Park CA2300644 | 280 | 0 | 0 | 1 | 10 ppbbelow the action level |
| Ridgewood Water System CA2300708 | 265 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Irish Beach Water District CA2310012 | 254 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Surfwood Mutual Water Corporation CA2300590 | 160 | 0 | 0 | 31 | 6.9 ppbbelow the action level |
| Creekside Cabins & RV Resort CA2300717 | 124 | 0 | 0 | 1 | 2.8 ppbbelow the action level |
| Bella Shores Mobile Home Park CA2300646 | 80 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Yokayo Tribe of Indians CA2300837 | 75 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Branscomb Mobile Home Park CA2300663 | 42 | 0 | 0 | 2 | 0 ppbbelow the action level |
| North Gualala Water Company CA2310007 | 2,593 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Laytonville County Water District CA2310011 | 1,152 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Hopland Public Utility District CA2310010 | 1,076 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Dolphin Isle Marina CA2300743 | 560 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Calpella County Water District CA2300507 | 548 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Point Arena Water Works CA2310013 | 459 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Westport County Water District CA2300730 | 369 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Pine Mountain Mutual Water Co. CA2300591 | 310 | 0 | 0 | 0 | 10 ppbbelow the action level |
| Mitomkai Tribal Water System 090605120 | 300 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Ocean'S Edge Estates CA2300634 | 250 | 0 | 0 | 0 | 0 ppbbelow the action level |
| River Estates Mutual Water Company CA2300605 | 250 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Caspar South Service Company CA2300610 | 188 | 0 | 0 | 0 | 2.7 ppbbelow the action level |
| Woods, the (Mendocino) CA2300667 | 157 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Meadow Estates Mutual CA2300506 | 100 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lake View Mutual Water Co. CA2300606 | 90 | 0 | 0 | 0 | 3.4 ppbbelow the action level |
| Hills Ranch Mutual Water Company CA2300832 | 79 | 0 | 0 | 0 | 16 ppbat or above the action level |
| Shorelands Road & Water Company CA2300545 | 78 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Albion Mutual Water Company CA2300502 | 56 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Point of View Mutual Water Co CA2300604 | 56 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Holly Ranch Village CA2300735 | 50 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Seafair Road and Water Company CA2300609 | 50 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Point Cabrillo Highlands CA2300668 | 42 | 0 | 0 | 0 | 2.7 ppbbelow the action level |
| Big River Vista Mutual Water Company CA2300596 | 36 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Covelo Mobile Home Park CA2300892 | 30 | 0 | 0 | 0 | 0 ppbbelow the action level |
Shaded rows report lead at or above the 15 ppb action level in their latest monitoring period. EPA sets that level for the value 9 in 10 sampled homes fall at or below; reaching it requires the utility to act, and it is not a measurement of any single tap. One system in this table is at or above it. What an action level means
USGS · Monitoring stations
The water, more recently.
Available station readings in Mendocino County, California. Each measurement keeps its time, unit and original source.
These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.
Recent observations load when this section comes into view.
How these readings update
We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.
Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.
Your next step
Water testing, reports & local help.
Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.
Official national directories
Water testing
Find your state’s private-well program
EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.
Water testing
Find a certified drinking-water laboratory
Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.
Public records
Find your utility’s Consumer Confidence Report
EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.
Public records
Explore USGS water observations
Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.
A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.
Understand water testing and laboratory reportsResource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction
Explore your area
Local coverage in Mendocino County
26ZIP areas in this overview
Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.
Towns and communities
- Albion
- Anchor Bay
- Boonville
- Brooktrails
- Caspar
- Comptche
- Covelo
- Fort Bragg
- Hopland
- Laytonville
- Leggett
- Little River
- Manchester
- Mendocino
- Philo
- Point Arena
- Potter Valley
- Redwood Valley
- Ukiah
View ZIP areas and understand coverage
- 95410Albion
- 95415Boonville
- 95417
- 95420Caspar
- 95427Comptche
- 95428Covelo
- 95429
- 95432
- 95437Fort Bragg
- 95445Anchor Bay
- 95449Hopland
- 95454Laytonville
- 95456Little River
- 95459Manchester
- 95460Mendocino
- 95463
- 95466Philo
- 95468Point Arena
- 95469Potter Valley
- 95470Redwood Valley
- 95482Ukiah
- 95488
- 95490Brooktrails
- 95494
- 95585Leggett
- 95587
These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.
Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.
Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.