Alton Water Works, NH
Above the federal action level
Latest 90th-percentile lead: 210 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. 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.
Alton Water Works at a glance
Alton Water Works serves about 1,800 people through 712 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 Belknap County, New Hampshire. EPA system ID: NH0061010. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
The highest 90th-percentile result EPA holds for Alton Water Works is 210 ppb across 1 monitoring period, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 210 ppb over 15 |
Where this result ranks
Of the 124 New Hampshire systems with a lead result, the median latest reading is 16 ppb; 62 are over 15 ppb right now and 64 have gone over at some point. Alton Water Works's 210 ppb sits at the 98th percentile in New Hampshire and the 100th nationally (higher means more lead).
Nearby utilities
64 other systems share Belknap County; 0 of them have a higher latest lead result than Alton Water Works. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Laconia Water Works | 17,125 | 4 ppb |
| Meredith Water Dept | 3,750 | 1 ppb |
| Locke Lake | 2,308 | - |
| Belmont Water Dept | 1,612 | - |
| Gunstock Acres Village Dist | 1,440 | - |
| New Hampton Village Pct | 600 | 27 ppb |
| Pine Gardens Mhp | 413 | - |
| Lochmere Village Dist | 405 | - |
| Samoset At Winnipesaukee | 343 | - |
| Mallards Landing | 325 | - |
Next steps for Alton, NH
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 Alton Water Works whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 2400 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. Why sampled homes are the worst-case ones is in the guide to reading the number. The action level is dropping - the 10 ppb rule from 2027.