Water Quality: Concord, NH
14 water systems • 47,171 people served
Multiple Health ViolationsWater Quality Summary
Concord is served by 14 public water systems with a combined service population of 47,171 people, and has 137 EPA Safe Drinking Water Act violations on record. Critically, 45 of those are health-based violations, meaning one or more contaminants were detected above EPA-established safe levels — a serious public health concern. Concord's violation count is 230% above the national average for New Hampshire. Contaminants associated with violations include Chlorine Dioxide, Disinfection Byproducts, E. coli, Fecal Coliform, TTHM.
Contaminants Found
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)
Indicates direct fecal contamination; associated with diarrhea, cramps, nausea, and potential severe illness.
Common source: Human and animal fecal waste
EPA limit: Zero tolerance (any positive triggers violations)
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)
Haloacetic acids are associated with increased cancer risk and potential reproductive and developmental effects.
Common source: Reaction of chlorine disinfectants with organic matter in treated water
EPA limit: 0.060 mg/L (60 ppb)
Water Systems Serving Concord
| System Name | PWSID | Source | Population | Violations |
|---|---|---|---|---|
| CONCORD WATER DEPT | NH0501010 | Surface Water | 44,215 | 0 |
| CONTOOCOOK VILLAGE PCT | NH1191010 | Surface Water | 1,600 | 32 |
| CATAMOUNT HILL | NH0043040 | Groundwater | 383 | 14 |
| TRANQUILITY ESTATES | NH1973060 | Groundwater | 315 | 18 |
| HOLLIS PINES COOP MHP WEST | NH1173020 | Groundwater | 220 | 13 |
| COTTAGES AT WINDCHIMES | NH0262040 | Groundwater | 75 | 5 |
| RUNNELLS LANDING | NH1172020 | Groundwater | 74 | 0 |
| MASCOMA VALLEY COOP | NH0353020 | Groundwater | 73 | 2 |
| NORTHERN VIEW APARTMENTS | NH2192020 | Groundwater | 50 | 32 |
| BARRINGTON HILLS APTS/UPPER | NH0152050 | Groundwater | 43 | 7 |
| BARRINGTON HILLS APTS/LOWER | NH0152030 | Groundwater | 38 | 3 |
| BOROUGH RD APARTMENTS | NH1862030 | Groundwater | 30 | 5 |
| WAKEFIELD ACRES | NH2392020 | Groundwater | 30 | 4 |
| CANTERBURY SPRUCES HOUSING | NH0374010 | Groundwater | 25 | 2 |
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.