Crass Mutual Water Company, CA
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 14.55 ppb (monitoring period 2018-2020). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
Crass Mutual Water Company at a glance
Crass Mutual Water Company serves about 80 people through 26 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: CA2000530; phone on file: 559-683-5973. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Crass Mutual Water Company's lead record
That is up 4.55 ppb from 10 ppb in the period ending 2017. The highest 90th-percentile result EPA holds for Crass Mutual Water Company is 14.55 ppb across 2 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2020 | 14.55 ppb over 10 |
| 2017 | 10 ppb |
How Crass Mutual Water Company compares
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. Crass Mutual Water Company's 14.55 ppb sits at the 99th percentile in California and the 99th nationally (higher means more lead).
Other water systems in Madera County
67 other systems share Madera County; 0 of them have a higher latest lead result than Crass Mutual Water Company. 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 |
Your move
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 Crass Mutual Water Company 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. Why sampled homes are the worst-case ones is in the guide to reading the number. See what changes at 10 ppb in 2027.