Lyon Mountain Water Dist, NY
Lead detected, under the action levels
Latest 90th-percentile lead: 1.2 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.
About Lyon Mountain Water Dist
Lyon Mountain Water Dist serves about 750 people through 252 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 groundwater, in Clinton County, New York. EPA system ID: NY0900215. Ask the utility on your bill for your address in their service line inventory.
Lead results over time
Against the period ending 2023 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Lyon Mountain Water Dist is 1.8 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.2 ppb |
| 2023 | 1 ppb |
| 2020 | 1 ppb |
| 2017 | 1.8 ppb |
Where this result ranks
Of the 2,077 New York systems with a lead result, the median latest reading is 1.5 ppb; 17 are over 15 ppb right now and 165 have gone over at some point. Lyon Mountain Water Dist's 1.2 ppb sits at the 42nd percentile in New York and the 59th nationally (higher means more lead).
Nearby utilities
37 other systems share Clinton County; 16 of them have a higher latest lead result than Lyon Mountain Water Dist. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Plattsburgh City | 24,173 | 2.2 ppb |
| Plattsburgh Consolidated Water District | 11,162 | 2.1 ppb |
| Clinton Correctional Facility | 3,001 | 1 ppb |
| Champlain Village | 2,947 | 1 ppb |
| Peru Wd | 2,700 | 9.2 ppb |
| Rouses Point Village Wd | 2,550 | 1.4 ppb |
| Morrisonville Water District | 1,300 | 1.4 ppb |
| Dannemora Village | 1,228 | 1.9 ppb |
| Cadyville Water District | 843 | 2 ppb |
| Chazy Water District | 690 | 4.5 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; your state 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 Lyon Mountain Water Dist 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Size matters more than most people expect: small vs large water systems.