Water Quality: Derry, NH
17 water systems • 18,748 people served
Multiple Health ViolationsWater Quality Summary
Derry is served by 17 public water systems with a combined service population of 18,748 people, and has 106 EPA Safe Drinking Water Act violations on record. Critically, 44 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Derry's violation count is 156% above the national average for New Hampshire. Contaminants associated with violations include Barium, Chlorine Dioxide, Disinfection Byproducts, E. coli, Selenium.
Contaminants Found
Increases blood pressure and causes cardiovascular effects with long-term exposure.
Common source: Natural rock deposits, oil drilling operations, coal power plant waste
EPA limit: 2 mg/L
Can cause anemia in infants and young children; may cause nervous system effects at high levels.
Common source: Water treatment disinfectant used to control taste, odor, and microorganisms
EPA limit: 0.8 mg/L
Broad category of chemicals formed during disinfection, associated with increased cancer risk and adverse reproductive effects.
Common source: Reaction of disinfectants (chlorine, ozone, chloramines) with organic matter
Causes gastrointestinal illness; certain strains (e.g., O157:H7) can cause severe kidney failure and death.
Common source: Fecal contamination from humans or animals entering the water supply
EPA limit: Zero (no E. coli permitted in drinking water)
Hair loss, nail brittleness, and nervous system damage at elevated concentrations.
Common source: Natural geological deposits, mining discharges, oil refinery waste
EPA limit: 0.05 mg/L (50 ppb)
Total trihalomethanes are linked to increased risk of bladder cancer and adverse reproductive outcomes.
Common source: Reaction of chlorine disinfectants with naturally occurring organic matter in water
EPA limit: 0.080 mg/L (80 ppb)
Water Systems Serving Derry
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| DERRY WATER DEPT | NH0611010 | Surface Water | 17,210 | 0 |
| ACKERMAN RETIREMENT PARK | NH2053020 | Groundwater | 350 | 5 |
| RAND SHEPARD HILL | NH0612230 | Groundwater | 158 | 1 |
| CENTENNIAL ESTATES | NH0613060 | Groundwater | 140 | 10 |
| BRANCH RIVER APARTMENTS | NH1972040 | Groundwater | 120 | 2 |
| STANYAN ROAD | NH1612270 | Groundwater | 113 | 6 |
| CANDIA CROSSING | NH0362020 | Groundwater | 80 | 0 |
| BARKLAND ACRES | NH0612040 | Groundwater | 80 | 18 |
| MORNINGSIDE DRIVE | NH0612050 | Groundwater | 80 | 6 |
| AUTUMN WOODS | NH0612220 | Groundwater | 73 | 0 |
| FOREST GLEN CONDOS | NH1932040 | Groundwater | 70 | 0 |
| WILLOW BEND | NH0612240 | Groundwater | 57 | 2 |
| OLD COACH VILLAGE | NH0612210 | Groundwater | 50 | 12 |
| RUNNING BROOK | NH0613030 | Groundwater | 47 | 6 |
| WILDER VILLAGE CLUSTER | NH1712040 | Groundwater | 45 | 5 |
| SHADY LANE APARTMENTS | NH1932220 | Groundwater | 42 | 19 |
| CAMELOT III | NH2542190 | Groundwater | 33 | 14 |
Concerned About Your Water?
A home water filter can remove common contaminants. NSF-certified filters are tested against EPA standards.
Consider a reverse osmosis system for comprehensive filtration or a carbon filter for basic improvement.
Other Cities in New Hampshire
Data Sources
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). Data includes all recorded violations for active community water systems.