Dayton Valley Water System, NV
Lead detected, under the action levels
Latest 90th-percentile lead: 1.9 ppb (monitoring period 2024-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Who runs the water here
Dayton Valley Water System serves about 16,000 people through 7,100 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Lyon County, Nevada. EPA system ID: NV0000032; phone on file: 775-246-6220. 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 1.1 ppb from 0.8 ppb in the period ending 2023. The highest 90th-percentile result EPA holds for Dayton Valley Water System is 3 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.9 ppb |
| 2023 | 0.8 ppb |
| 2020 | 2 ppb |
| 2019 | 1.3 ppb |
| 2017 | 1 ppb |
| 2016 | 3 ppb |
How Dayton Valley Water System compares
Of the 204 Nevada systems with a lead result, the median latest reading is 1 ppb; 0 are over 15 ppb right now and 13 have gone over at some point. Dayton Valley Water System's 1.9 ppb sits at the 68th percentile in Nevada and the 69th nationally (higher means more lead).
Other water systems in Lyon County
5 other systems share Lyon County; 1 of them has a higher latest lead result than Dayton Valley Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Fernley Public Works | 23,064 | 0 (not detected) |
| Yerington City Of | 5,050 | 2.7 ppb |
| Silver Springs Mutual Water Company | 3,070 | 1 ppb |
| Stagecoach Gid | 1,628 | 0 (not detected) |
| Weed Heights Development | 340 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Dayton, NV 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 Dayton Valley 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. 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.