Tap water quality in Derry, New Hampshire
Derry's water systems logged 1 health-based EPA violation in 2021–2026, most recently in 2023 — a modest record, with nitrate the issue found. For context, New Hampshire's systems average 1.5 health-based violations each.
Averages describe states, not your faucet. A certified home water test screens for lead, nitrates, bacteria and dozens of other contaminants — the same categories EPA regulates.
Test your water at homeWe may earn a commission if you request quotes through this link. It costs you nothing and never affects the data we publish.
Derry tap water FAQ
Is tap water safe to drink in Derry?
Derry's systems logged 1 health-based violation in 2021–2026, most commonly nitrate. A violation is a red flag for a period of time, not a permanent condition — your utility's current Consumer Confidence Report shows today's status, and a certified home test shows what's at your tap.
Who supplies Derry's water?
Derry Water Dept (serving about 17,290 people); Drew Woods (serving about 1,408 people); Maple Hill Acres (serving about 523 people); Oakwood Terrace (serving about 307 people). Data: EPA Safe Drinking Water Information System, July 2026.
How hard is the water in Derry?
City-level hardness isn't published in a single federal dataset, but New Hampshire averages 60 PPM — "soft" on the USGS scale. Your utility's water quality report lists Derry's exact hardness, or a $10 test strip tells you in a minute. If it comes back over 120 PPM, see our water softener guidance in the purification calculator.
Do I need a water filter in Derry?
With 1 health-based violation on record in 2021–2026, a certified filter is reasonable insurance here: reverse osmosis ($150–$1,300 installed, Angi 2026) covers lead, nitrates and PFAS at the tap. Test first ($50–$200) so you buy for what's actually present.
Averages describe states, not your faucet. A certified home water test screens for lead, nitrates, bacteria and dozens of other contaminants — the same categories EPA regulates.
Test your water at homeWe may earn a commission if you request quotes through this link. It costs you nothing and never affects the data we publish.