Public water system record
Alton Water Works
Serves an area of Belknap County, NH that includes Alton · 1,800 people served
Federal records show 2 health-based violations and no monitoring/reporting issues for Alton Water Works in the last ten years. The most serious issue in this window was a resolved Arsenic violation.
System profile
- Health-based violations, last 10 years
- 2
- Resolved
- 2
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 0
Key facts
- Alton Water Works draws water from 2 wells.
- Highest measured level in the last 10 years: Arsenic, 0.019 mg/L, federal limit 0.01 mg/L (1.9 times the limit), 2020.
- Record on file since 1991, with 14 health-based violations before October 19, 2016.
Check whether Alton Water Works serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Arsenic
Contaminant limit exceeded
Measured 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit)
|
330 | Jul 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.019 mg/L, federal limit 0.01 mg/L (1.9 times the limit)
|
330 | Apr 1, 2020 | Resolved | No |
Full record since 1991
EPA's records for Alton Water Works go back to 1991. Before October 19, 2016 they list 14 health-based violations (12 resolved, 2 archived by EPA without a recorded fix) and 98 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 6 | 41 |
| 2000s | 4 | 23 |
| 2010 to October 18, 2016 | 4 | 34 |
| 2020s | 2 | 0 |
Most recent health-based violation before October 19, 2016: Total Coliform, began September 2011, Resolved.
Show all 14 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2011 | Resolved |
|
Antimony, Total
Contaminant limit exceeded
Measured 0.007 mg/L, federal limit 0.006 mg/L (1.2 times the limit)
|
Jan 1, 2011 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2010 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2010 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2009 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Mar 1, 2008 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2005 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2001 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 1999 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 1996 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jan 1, 1996 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 1995 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 1992 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 1991 | Archived |
What the violations mean
Arsenic
2 incidentsArsenic exceeded the federal limit
Long-term arsenic exposure is linked to cancer and cardiovascular effects
Where the water comes from
Alton Water Works draws water from 2 wells.
Annual water quality report
Alton Water Works must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by New Hampshire.
Certified drinking water labs by state EPA guidance for private wells