Londonderry Water Quality
New Hampshire
According to EPA SDWIS, Londonderry, New Hampshire is served by 3 community water systems covering about 523 people. The same extract lists 12 health-based violation records, most recently coded 4010 in 2023. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Londonderry, New Hampshire is delivered through 3 EPA-regulated community water systems serving an estimated 523 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 12 violation records across the 3 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 4 distinct EPA contaminant codes: Combined Radium (-226 and -228), Arsenic, Groundwater Rule, Lead and Copper Rule. 5 TRI-reporting industrial facilities are also located within the city limits.
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the New Hampshire drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| COTTON FARMS MHP | 390 | 6 | Health |
| HANAFIN FARM | 105 | 0 | Clean |
| BITIM APARTMENTS | 28 | 6 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| COTTON FARMS MHP | Combined Radium (-226 and -228) | 2023-01-01 |
| COTTON FARMS MHP | Combined Radium (-226 and -228) | 2023-01-01 |
| BITIM APARTMENTS | Arsenic | 2020-04-01 |
| BITIM APARTMENTS | Arsenic | 2020-01-01 |
| BITIM APARTMENTS | Arsenic | 2019-10-01 |
| BITIM APARTMENTS | Arsenic | 2019-07-01 |
| BITIM APARTMENTS | Groundwater Rule | 2019-06-01 |
| BITIM APARTMENTS | Groundwater Rule | 2019-01-16 |
| COTTON FARMS MHP | Groundwater Rule | 2013-09-15 |
| COTTON FARMS MHP | Groundwater Rule | 2012-12-21 |
| COTTON FARMS MHP | Lead and Copper Rule | 2009-04-01 |
| COTTON FARMS MHP | Lead and Copper Rule | 2006-10-01 |
What are Londonderry's health-based records for?
Londonderry's health-based violation records carry 4 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Groundwater Rule | 4 | 2 |
| Arsenic | 4 | 1 |
| Combined Radium (-226 and -228) | 2 | 1 |
| Lead and Copper Rule | 2 | 1 |
TRI Facilities in Londonderry
| Facility | Total Releases |
|---|---|
| Hologic Inc | 10.7K lbs |
| L3 Technologies Inc. | 6.3K lbs |
| Kluber Lubrication Na LP | 138 lbs |
| Lactalis US Yogurt Inc. | 129 lbs |
| Alcumet Inc | 58 lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Londonderry, New Hampshire? ▼
How many water violations does Londonderry have in this EPA extract? ▼
What contaminants were found in Londonderry water? ▼
How many water systems serve Londonderry? ▼
Where does Londonderry get its drinking water? ▼
Are there pollution sources near Londonderry? ▼
How does Londonderry compare in New Hampshire?
Of the 179 New Hampshire places with at least one community water system on file, Londonderry ranks #56 by number of systems (3).
Either side of it: Keene (3), Kingston (3), Meriden (3), Merrimack (3)
About This Data
Figures here are the current EPA SDWIS extract joined to the 3 community water systems whose service area lists Londonderry, ranked against the 179 New Hampshire places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.