Griswold Mhp Llc, NY
Above the new 10 ppb level coming in 2027
Latest 90th-percentile lead: 15 ppb (monitoring period 2026-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Under the current 15 ppb rule this is not an exceedance, but it is above the 10 ppb action level that takes over in Nov 2027. Test your own tap; filter if your result shows lead.
About Griswold Mhp Llc
Griswold Mhp Llc serves about 99 people through 39 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in New London County, New York. EPA system ID: CT0580031; phone on file: 212-951-3812. 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 14.4 ppb from 0.6 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Griswold Mhp Llc is 15 ppb across 15 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 15 ppb over 10 |
| 2025 | 0.6 ppb |
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2023 | 1.6 ppb |
| 2023 | 1.7 ppb |
| 2022 | 1.8 ppb |
| 2022 | 1.2 ppb |
| 2021 | 2.1 ppb |
| 2021 | 2.5 ppb |
| 2020 | 3.2 ppb |
| 2020 | 0.7 ppb |
| 2019 | 6.2 ppb |
| 2016 | 5 ppb |
How Griswold Mhp Llc 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. Griswold Mhp Llc's 15 ppb sits at the 99th percentile in New York and the 99th nationally (higher means more lead).
Neighbouring systems
4 other systems share New London County; 0 of them have a higher latest lead result than Griswold Mhp Llc. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Colchester Estates | 276 | 1.4 ppb |
| Mountview Apartments | 105 | 0 (not detected) |
| Deer Run Supply | 84 | 1.3 ppb |
| Oakridge Village | 33 | 5.6 ppb |
Next steps for Great Neck, NY
Test your own tap with a certified lab first-draw sample; Great Neck, 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 Griswold Mhp Llc whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 2680 ppb (copper action level 1,300 ppb).
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. This system is in the band the 2027 10 ppb rule changes.