Seymour'S Mutual Water System, CA
Exceeded the action level in the past
Latest 90th-percentile lead: 2.55 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 Seymour'S Mutual Water System
Seymour'S Mutual Water System serves about 40 people through 26 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Trinity County, California. EPA system ID: CA5301201; phone on file: 530-266-3227. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Seymour'S Mutual Water System's lead record
That is down 18.95 ppb from 21.5 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Seymour'S Mutual Water System is 56.5 ppb across 3 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2027 | 2.55 ppb |
| 2021 | 21.5 ppb over 15 |
| 2018 | 56.5 ppb over 15 |
How Seymour'S Mutual Water System 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. Seymour'S Mutual Water System's 2.55 ppb sits at the 82nd percentile in California and the 78th nationally (higher means more lead).
Neighbouring systems
15 other systems share Trinity County; 1 of them has a higher latest lead result than Seymour'S Mutual Water System. 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 Co. W.W. Dist #1 | 2,324 | 2.4 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 |
What to do in your house
Test your own tap with a certified lab first-draw sample; Trinity Center, 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 Seymour'S Mutual Water System 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. More in what a past exceedance means today.