Usmc - Housing Coleville, CA
Lead detected, under the action levels
Latest 90th-percentile lead: 1.3 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
Usmc - Housing Coleville serves about 424 people through 116 service connections, which makes it a very small system under EPA's size classes. It is federally owned and draws groundwater, in Mono County, California. EPA system ID: CA2610701; phone on file: 760-932-1592. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2023 (0.9 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Usmc - Housing Coleville is 1.3 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.3 ppb |
| 2023 | 0.9 ppb |
| 2020 | 0 (not detected) |
| 2017 | 1.1 ppb |
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. Usmc - Housing Coleville's 1.3 ppb sits at the 73rd percentile in California and the 60th nationally (higher means more lead).
Neighbouring systems
17 other systems share Mono County; 10 of them have a higher latest lead result than Usmc - Housing Coleville. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Mammoth Cwd | 8,234 | 1.5 ppb |
| Mountain Meadows Mwc | 525 | 4.4 ppb |
| Bridgeport Pud | 374 | 1.9 ppb |
| Lower Rock Creek Mutual Water Co. | 310 | 0 (not detected) |
| June Lake Pud - Down Canyon | 310 | 2 ppb |
| Usmc/Mtn Warfare Trng Ctr - Bridgeport | 300 | 1 ppb |
| June Lake Pud Village | 263 | 2.7 ppb |
| Crowley Lake Trailer Park | 230 | 9.4 ppb |
| Lee Vining Public Utility District | 222 | 8 ppb |
| Lundy Mutual Water Company | 200 | 3.7 ppb |
Next steps for Bridgeport, CA
Test your own tap with a certified lab first-draw sample; Bridgeport, 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 Usmc - Housing Coleville 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. The action level is dropping - the 10 ppb rule from 2027.