County · California
Madera County, California: drinking water records
Explore EPA records for 68 community water systems across 13 ZIP codes in Madera 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 68 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 68 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 |
|---|---|---|---|---|---|
| Yosemite Spring Park Util Co CA2010005 | 5,300 | 540 | 6 | 13 | 8.4 ppbbelow the action level |
| Cal Am - Oakhurst CA2010007 | 3,693 | 240 | 0 | 20 | 5 ppbbelow the action level |
| Bakman Water-Rolling Hills CA2010009 | 1,107 | 180 | 0 | 2 | 4.2 ppbbelow the action level |
| City of Madera CA2010002 | 66,560 | 540 | 0 | 0 | 3 ppbbelow the action level |
| Chowchilla City Water Dept CA2010001 | 13,916 | 360 | 1 | 0 | 0 ppbbelow the action level |
| Madera Valley Water Company CA2010010 | 6,494 | 300 | 0 | 0 | 0 ppbbelow the action level |
| Riverstone/Rootcreek Water District CA2010016 | 5,507 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Cal Am - Bass Lake CA2010003 | 4,527 | 300 | 1 | 0 | 2 ppbbelow the action level |
| Broadview Terrace Mutual Water Company CA2000521 | 498 | 0 | 0 | 1 | 2.9 ppbbelow the action level |
| Skp Park of the Sierras INC CA2000832 | 450 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Cal Am - Raymond CA2010012 | 343 | 0 | 0 | 28 | 1 ppbbelow the action level |
| Md 46 Ahwahnee Resorts CA2000293 | 300 | 0 | 0 | 5 | 1 ppbbelow the action level |
| Md 08 North Fork Water System CA2000561 | 264 | 0 | 0 | 32 | 0 ppbbelow the action level |
| Bass Lake Heights Mutual Water CA2000502 | 250 | 0 | 0 | 2 | 3.9 ppbbelow the action level |
| East Acres Mutual Water Company CA2000512 | 250 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Md 05 Mountain Ranches CA2000549 | 239 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Md 07 Marina View Heights CA2000551 | 200 | 0 | 0 | 29 | 2.4 ppbbelow the action level |
| Sierra Linda Mutual Water Co CA2000506 | 200 | 0 | 0 | 52 | 3.1 ppbbelow the action level |
| Sky Acres Mutual Water Corp CA2000524 | 175 | 0 | 0 | 2 | 12 ppbbelow the action level |
| Madera Co MD1-HIDDEN Lake Estates CA2000544 | 162 | 0 | 0 | 73 | 0.8 ppbbelow the action level |
| Md 24 Teaford Meadow Lakes CA2000552 | 150 | 0 | 0 | 47 | 5.5 ppbbelow the action level |
| Cedar Valley Mutual Water Co CA2000538 | 137 | 0 | 0 | 28 | 0.8 ppbbelow the action level |
| Madera Co SA16 Sumner Hill CA2000729 | 135 | 0 | 0 | 58 | 3.1 ppbbelow the action level |
| Sugar Pine Homeowners Assoc CA2000533 | 120 | 0 | 0 | 1 | 2 ppbbelow the action level |
| Yosemite Forks Est Mutual CA2000527 | 110 | 0 | 0 | 33 | 0 ppbbelow the action level |
| Wildwood Mobile Home Pk INC CA2000608 | 106 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Ecco CA2000688 | 100 | 0 | 0 | 2 | 1.9 ppbbelow the action level |
| Md 42 Still Meadow CA2000737 | 100 | 0 | 0 | 64 | 0 ppbbelow the action level |
| Crass Mutual Water Company CA2000530 | 80 | 0 | 0 | 1 | 14.6 ppbbelow the action level |
| John Hovannisian Water System CA2000647 | 80 | 0 | 0 | 1 | 1 ppbbelow the action level |
| Pike Ranch Mutual Water Co CA2000526 | 74 | 0 | 0 | 7 | 13 ppbbelow the action level |
| Marquez Rental CA2000800 | 50 | 0 | 0 | 3 | 0.6 ppbbelow the action level |
| Leisure Acres Mutual Water Company CA2000534 | 45 | 0 | 0 | 5 | 2.3 ppbbelow the action level |
| Bass Lake Annex 3 CA2000501 | 42 | 0 | 0 | 6 | 12 ppbbelow the action level |
| Two Twenty Four Mobile Home Pk CA2000592 | 35 | 0 | 0 | 25 | 20.4 ppbat or above the action level |
| Mammoth Pool Mobile Home Park CA2000589 | 30 | 0 | 0 | 2 | 1.0 ppbbelow the action level |
| Shady Oaks Mobile Home Park LLC CA2000828 | 23 | 0 | 0 | 17 | 6 ppbbelow the action level |
| Tesoro Viejo Master Mwc, INC. CA2010017 | 3,885 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Valley State Prison CA2010801 | 3,173 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Madera Co MD10A-MADERA Ranchos CA2010008 | 3,172 | 0 | 0 | 0 | 5.4 ppbbelow the action level |
| Central Ca Womens Facility CA2010800 | 2,183 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Madera Co SA3-PARKSDALE CA2010006 | 1,789 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Madera Co Cmd19-Parkwood CA2010004 | 1,637 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Madera Co SA1-INDIAN Lakes CA2010011 | 1,562 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cal Am - Goldside CA2010014 | 1,043 | 0 | 0 | 0 | 6 ppbbelow the action level |
| Preserve at Millerton Lake Water System CA2010018 | 600 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Md 33 Fairmead CA2000554 | 568 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Madera Mh & RV Park CA2000595 | 450 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Md 73 Quartz Mountain CA2000690 | 375 | 0 | 0 | 0 | 5 ppbbelow the action level |
| Oak Creek Mobile Home Park CA2000775 | 370 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Md 37 la Vina CA2000728 | 350 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Md 63 Meadow Springs Ranch CA2000757 | 300 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Md 40 Sunset Ridge Estates CA2000851 | 150 | 0 | 0 | 0 | 6.2 ppbbelow the action level |
| Md 60 Dillon Estates CA2000849 | 150 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Md 95 Ranchos West CA2000692 | 150 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Oakhurst Mobile Home Estates CA2000593 | 138 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cascadel Mutual Water System CA2000509 | 137 | 0 | 0 | 0 | 8 ppbbelow the action level |
| Md 43 Miami Creek Knolls CA2000557 | 100 | 0 | 0 | 0 | 1.3 ppbbelow the action level |
| Sa 14 Chuk Chanse Subdivision CA2000724 | 100 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Bonadelle Ranchos No. 2 Mutual Water Co CA2000529 | 92 | 0 | 0 | 0 | 6 ppbbelow the action level |
| Md 36 Eastin Arcola CA2000727 | 84 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cal Am - Coarsegold CA2010013 | 83 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Md 58 Sierra Highlands CA2000865 | 75 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Md 28 Ripperdan Self Help CA2000553 | 48 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Md 85 Valeta CA2000511 | 45 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| The Village CA2000573 | 40 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Whispering Pines MHP CA2000605 | 38 | 0 | 0 | 0 | 0.6 ppbbelow the action level |
| Madera Co Csa 22c Gunner Ranch CA2010019 | 3,050 | 0 | 0 | 0 | not reported |
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 Madera 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 Madera County
13ZIP 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
- Ahwahnee
- Bass Lake
- Bonadelle Ranchos
- Chowchilla
- Madera
- Madera Acres
- Millerton
- North Fork
- Oakhurst
- Yosemite Lakes
View ZIP areas and understand coverage
- 93601Ahwahnee
- 93604Bass Lake
- 93610Chowchilla
- 93614Yosemite Lakes
- 93626Millerton
- 93636Bonadelle Ranchos
- 93637Madera
- 93638Madera Acres
- 93643North Fork
- 93644Oakhurst
- 93645
- 93653
- 93669North Fork
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.