Marina Mobile Manor, CA
Above the federal action level
Latest 90th-percentile lead: 24 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. In the most recent monitoring period, more than 10% of the sampled homes measured above 15 ppb. Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking now, and test your own tap.
Who runs the water here
Marina Mobile Manor serves about 75 people through 24 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Contra Costa County, California. EPA system ID: CA0707608; phone on file: 510-325-2979. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is up 19 ppb from 5 ppb in the period ending 2017. The highest 90th-percentile result EPA holds for Marina Mobile Manor is 24 ppb across 2 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 24 ppb over 15 |
| 2017 | 5 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. Marina Mobile Manor's 24 ppb sits at the 99th percentile in California and the 99th nationally (higher means more lead).
Nearby utilities
38 other systems share Contra Costa County; 0 of them have a higher latest lead result than Marina Mobile Manor. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Contra Costa Water District | 210,500 | 0 (not detected) |
| City Of Antioch | 116,781 | 0 (not detected) |
| Brentwood | 64,513 | 0 (not detected) |
| City Of Pittsburg | 62,500 | 0 (not detected) |
| Diablo Water District | 47,158 | 1.9 ppb |
| City Of Martinez | 31,015 | 0 (not detected) |
| Golden State Water Company - Bay Point | 23,765 | 0.49 ppb |
| Town Of Discovery Bay | 16,790 | 0 (not detected) |
| Pleasantimes Mutual Water Co | 644 | 0.5 ppb |
| Clayton Palms Water | 549 | - |
Your move
Use a filter certified to NSF/ANSI 53 for lead on the tap you drink and cook from, now, before you test. Then test your own tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Marina Mobile Manor 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. The action level is dropping - the 10 ppb rule from 2027.