Tucker Acres Mutual Water Co., CA
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 14 ppb (monitoring period 2026-2026). 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.
Tucker Acres Mutual Water Co. at a glance
Tucker Acres Mutual Water Co. serves about 200 people through 22 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Napa County, California. EPA system ID: CA2800516; phone on file: 510-290-9859. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is up 4 ppb from 10 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Tucker Acres Mutual Water Co. is 14 ppb across 6 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 14 ppb over 10 |
| 2025 | 10 ppb |
| 2021 | 2.6 ppb |
| 2018 | 1.3 ppb |
| 2017 | 0 (not detected) |
| 2016 | 3.65 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. Tucker Acres Mutual Water Co.'s 14 ppb sits at the 99th percentile in California and the 99th nationally (higher means more lead).
Other water systems in Napa County
27 other systems share Napa County; 1 of them has a higher latest lead result than Tucker Acres Mutual Water Co.. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Napa, City Of | 84,804 | 0 (not detected) |
| American Canyon, City Of | 18,423 | 0 (not detected) |
| Calistoga, City Of | 5,610 | 0 (not detected) |
| St. Helena, City Of | 5,386 | 0 (not detected) |
| Town Of Yountville | 2,785 | 0 (not detected) |
| Howell Mountain Mutual Water Company | 1,244 | 0 (not detected) |
| Veterans Home Of California | 1,000 | 0 (not detected) |
| Pacific Union College | 758 | 7.8 ppb |
| Berryessa Highlands | 715 | 0 (not detected) |
| Adventist Health - St. Helena Hospital | 617 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Calistoga, 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 Tucker Acres 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. See what changes at 10 ppb in 2027.