Washington Water District, CA
Above the federal action level
Latest 90th-percentile lead: 41.4 ppb (monitoring period 2021-2023). 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.
About Washington Water District
Washington Water District serves about 330 people through 115 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Nevada County, California. EPA system ID: CA2900523; phone on file: 530-265-4720. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is up 33.58 ppb from 7.82 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Washington Water District is 41.4 ppb across 3 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 41.4 ppb over 15 |
| 2020 | 7.82 ppb |
| 2017 | 0.86 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. Washington Water District's 41.4 ppb sits at the 100th percentile in California and the 100th nationally (higher means more lead).
Other water systems in Nevada County
20 other systems share Nevada County; 0 of them have a higher latest lead result than Washington Water District. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Truckee-Donner Pud, Main | 36,730 | 3.9 ppb |
| Nevada Id - E. George, Banner Mountain | 17,154 | 0 (not detected) |
| Nevada Id - Loma Rica | 14,072 | 0.77 ppb |
| Nevada Id - Lake Wildwood | 9,108 | 0 (not detected) |
| Nevada Id - Lake Of Pines | 6,870 | 0 (not detected) |
| City Of Grass Valley | 4,947 | 0.88 ppb |
| City Of Nevada City | 3,148 | 0 (not detected) |
| Creekside Village | 300 | 0 (not detected) |
| Ananda Village | 226 | 0 (not detected) |
| Rough & Ready Village | 154 | 5.63 ppb |
What to do in your house
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 Washington Water District 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. Systems that went over once often dip back under; here is what that means.