Antoinette Mutual Water Co, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 4.86 ppb (monitoring period 2020-2022). 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.
Who runs the water here
Antoinette Mutual Water Co serves about 25 people through 12 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Tehama County, California. EPA system ID: CA5201140; phone on file: 530-736-2321. 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 up 4.86 ppb from 0 ppb in the period ending 2019. The highest 90th-percentile result EPA holds for Antoinette Mutual Water Co is 4.86 ppb across 2 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2022 | 4.86 ppb |
| 2019 | 0 (not detected) |
Where this result ranks
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. Antoinette Mutual Water Co's 4.86 ppb sits at the 91st percentile in California and the 90th nationally (higher means more lead).
Neighbouring systems
47 other systems share Tehama County; 2 of them have a higher latest lead result than Antoinette 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 Red Bluff | 14,286 | 0 (not detected) |
| City Of Corning | 8,244 | 1.08 ppb |
| Rio Alto Water District | 3,377 | 0 (not detected) |
| Los Molinos Comm. Services Dist. | 1,450 | 0 (not detected) |
| Gerber Las Flores Csd | 1,200 | 0 (not detected) |
| Mineral County Water District | 634 | 4.21 ppb |
| Rio Vista Mobile Home Park | 543 | 7.35 ppb |
| Vista Grande Water System | 468 | 0.89 ppb |
| City Of Tehama | 436 | 0 (not detected) |
| Sky View County Water | 429 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Red Bluff, 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 Antoinette 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. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.