Trinity Co. W.W. Dist #1, CA
Exceeded the action level in the past
Latest 90th-percentile lead: 2.4 ppb (monitoring period 2025-2027). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Trinity Co. W.W. Dist #1
Trinity Co. W.W. Dist #1 serves about 2,324 people through 601 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Trinity County, California. EPA system ID: CA5310002; phone on file: 530-628-5449. 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 down 41.7 ppb from 44.1 ppb in the period ending 2026. The highest 90th-percentile result EPA holds for Trinity Co. W.W. Dist #1 is 44.1 ppb across 4 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2027 | 2.4 ppb |
| 2026 | 44.1 ppb over 15 |
| 2020 | 0 (not detected) |
| 2017 | 0 (not detected) |
How Trinity Co. W.W. Dist #1 compares
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. Trinity Co. W.W. Dist #1's 2.4 ppb sits at the 81st percentile in California and the 77th nationally (higher means more lead).
Nearby utilities
15 other systems share Trinity County; 2 of them have a higher latest lead result than Trinity Co. W.W. Dist #1. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Weaverville C.S.D. | 3,975 | 1.2 ppb |
| Trinity Center M.W.C. | 729 | 1.82 ppb |
| Lewiston Community Services District | 677 | 1 ppb |
| Trinity Village Mutual Water | 330 | 2 ppb |
| Salyer Mutual Wc (Formerly Riverview Ac) | 231 | 0 (not detected) |
| Trinity Knolls Mutual Water Company | 138 | 1.5 ppb |
| Treasure Creek Woods Mwc | 131 | 0.58 ppb |
| Salyer Heights W.S., Inc | 130 | 0 (not detected) |
| Burnt Ranch Estates | 115 | 1.28 ppb |
| Rush Creek Mutual Water System | 102 | 0 (not detected) |
Next steps for Hayfork, CA
Test your own tap with a certified lab first-draw sample; Hayfork, 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 Trinity Co. W.W. Dist #1 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. More in what a past exceedance means today.