Cedar Valley Mutual Water Co, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 0.81 ppb (monitoring period 2023-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Cedar Valley Mutual Water Co at a glance
Cedar Valley Mutual Water Co serves about 137 people through 67 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Madera County, California. EPA system ID: CA2000538; phone on file: 559-250-4086. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is down 6.67 ppb from 7.48 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Cedar Valley Mutual Water Co is 10 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.81 ppb |
| 2022 | 7.48 ppb |
| 2019 | 2.1 ppb |
| 2016 | 10 ppb |
Against other California systems
Of the 2,884 California systems with a lead result, the median latest reading is 0 ppb; 30 are over 15 ppb right now and 215 have gone over at some point. Cedar Valley Mutual Water Co's 0.81 ppb sits at the 68th percentile in California and the 48th nationally (higher means more lead).
Nearby utilities
67 other systems share Madera County; 30 of them have a higher latest lead result than Cedar Valley Mutual Water Co. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Madera | 66,560 | 3 ppb |
| Chowchilla City Water Dept | 13,916 | 0 (not detected) |
| Riverstone/Rootcreek Water District | 10,276 | 1.2 ppb |
| Madera Valley Water Company | 6,524 | 0 (not detected) |
| Yosemite Spring Park Util Co | 5,300 | 0 (not detected) |
| Tesoro Viejo Master Mwc, Inc. | 4,660 | 0 (not detected) |
| Cal Am - Oakhurst | 3,710 | 5 ppb |
| Valley State Prison | 3,151 | 0 (not detected) |
| Madera Co Md10a-Madera Ranchos | 3,072 | 5.4 ppb |
| Cal Am - Bass Lake | 3,066 | 2 ppb |
Next steps for Oakhurst, CA
Test your own tap with a certified lab first-draw sample; Oakhurst, CA may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Cedar Valley Mutual Water Co whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. Size matters more than most people expect: small vs large water systems.