Mahopac Water Co, NY
Exceeded the action level in the past
Latest 90th-percentile lead: 6.4 ppb (monitoring period 2024-2024). 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 Mahopac Water Co
Mahopac Water Co serves about 662 people through 278 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Putnam County, New York. EPA system ID: NY3905707; phone on file: 845-540-9546. They can tell you what your service line is made of and whether they pay to replace it.
Mahopac Water Co's lead record
Against the period ending 2024 (6 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Mahopac Water Co is 55.35 ppb across 5 monitoring periods, 2 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 6.4 ppb |
| 2024 | 6 ppb |
| 2023 | 14.7 ppb over 10 |
| 2022 | 18.5 ppb over 15 |
| 2021 | 55.35 ppb over 15 |
How Mahopac Water Co compares
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. Mahopac Water Co's 6.4 ppb sits at the 91st percentile in New York and the 94th nationally (higher means more lead).
Other water systems in Putnam County
97 other systems share Putnam County; 14 of them have a higher latest lead result than Mahopac Water Co. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Carmel Wd 2 | 5,000 | 6.9 ppb |
| Cold Spring Village | 2,666 | 1.7 ppb |
| Brewster Village | 2,162 | 7.9 ppb |
| Continental Village Wd | 1,509 | 4 ppb |
| Mount Ebo Ws | 1,500 | 2.1 ppb |
| Carmel Wd 3 | 1,350 | 0 (not detected) |
| Brewster Heights | 1,350 | 1.5 ppb |
| Watchtower Bible Tract Society | 1,251 | 0.4 ppb |
| Carmel Wd 8 | 1,000 | 1 ppb |
| Hunters Glen Condominium Ws | 875 | 1.5 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; West Nyack, NY 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 Mahopac Water Co 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.