White Oak Mutual Water Company, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 1.56 ppb (monitoring period 2024-2026). 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
White Oak Mutual Water Company serves about 415 people through 126 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Shasta County, California. EPA system ID: CA4500204; phone on file: 530-365-7655. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
White Oak Mutual Water Company's lead record
Against the period ending 2023 (1.01 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for White Oak Mutual Water Company is 1.56 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.56 ppb |
| 2023 | 1.01 ppb |
| 2020 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2016 | 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. White Oak Mutual Water Company's 1.56 ppb sits at the 75th percentile in California and the 64th nationally (higher means more lead).
Neighbouring systems
58 other systems share Shasta County; 22 of them have a higher latest lead result than White Oak 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 Redding | 90,254 | 2.13 ppb |
| Bella Vista Water District | 18,767 | 1.83 ppb |
| City Of Anderson | 11,323 | 2.4 ppb |
| City Of Shasta Lake | 10,371 | 1.13 ppb |
| Clear Creek Csd-Anderson | 8,900 | 3.61 ppb |
| Centerville C.S.D. | 4,244 | 2.09 ppb |
| Cottonwood Water District | 3,316 | 0 (not detected) |
| Shasta C.S.D. | 3,069 | 0.97 ppb |
| Burney Water District | 3,000 | 0.87 ppb |
| Mountain Gate C.S.D. | 2,227 | 2.84 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Cottonwood, 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 White Oak 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. Size matters more than most people expect: small vs large water systems.