June 17, 2026
Nitrates in New Hampshire Drinking Water 2026
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Nitrates in New Hampshire Drinking Water 2026
Nitrates contamination has been detected in drinking water systems across New Hampshire. High nitrate levels cause methemoglobinemia (blue baby syndrome) in infants. EPA MCL is 10 mg/L. Our analysis of New Hampshire water quality reports found Nitrates present in 232 cities and water systems statewide. If you live in one of these communities, a certified home filter can significantly reduce your exposure -- browse Nitrates filters at PureWaterGuys.
Cities in New Hampshire with Nitrates Detected
The following 232 water systems in New Hampshire reported Nitrates in their annual water quality reports. Click any city to read the full report.
| City / Water System | Water Quality Report |
|---|---|
| Allenstown Nh Water Quality Report 2026 | View Report |
| Alstead Nh Water Quality Report 2026 | View Report |
| Alton Nh Water Quality Report 2026 | View Report |
| Amesbury Nh Water Quality Report 2026 | View Report |
| Amherst Nh Water Quality Report 2026 | View Report |
| Andover Nh Water Quality Report 2026 | View Report |
| Antrim Nh Water Quality Report 2026 | View Report |
| Arlington Nh Water Quality Report 2026 | View Report |
| Atkinson Nh Water Quality Report 2026 | View Report |
| Atkinston Nh Water Quality Report 2026 | View Report |
| Barrington Nh Water Quality Report 2026 | View Report |
| Bartlett Nh Water Quality Report 2026 | View Report |
| Bath Nh Water Quality Report 2026 | View Report |
| Bedford Nh Water Quality Report 2026 | View Report |
| Beecher Falls Nh Water Quality Report 2026 | View Report |
| Bellows Falls Nh Water Quality Report 2026 | View Report |
| Belmont Nh Water Quality Report 2026 | View Report |
| Bennington Nh Water Quality Report 2026 | View Report |
| Berlin Nh Water Quality Report 2026 | View Report |
| Bethlehem Nh Water Quality Report 2026 | View Report |
| Boston Nh Water Quality Report 2026 | View Report |
| Bow Nh Water Quality Report 2026 | View Report |
| Brentwood Nh Water Quality Report 2026 | View Report |
| Bristol Nh Water Quality Report 2026 | View Report |
| Brunswick Nh Water Quality Report 2026 | View Report |
| Burlington Nh Water Quality Report 2026 | View Report |
| Campton Nh Water Quality Report 2026 | View Report |
| Canaan Nh Water Quality Report 2026 | View Report |
| Center Conway Nh Water Quality Report 2026 | View Report |
| Center Harbor Nh Water Quality Report 2026 | View Report |
| Center Ossipee Nh Water Quality Report 2026 | View Report |
| Center Tuftonboro Nh Water Quality Report 2026 | View Report |
| Charlestown Nh Water Quality Report 2026 | View Report |
| Chepachet Nh Water Quality Report 2026 | View Report |
| Chester Nh Water Quality Report 2026 | View Report |
| Chesterfield Nh Water Quality Report 2026 | View Report |
| Chichester Nh Water Quality Report 2026 | View Report |
| Chocorua Nh Water Quality Report 2026 | View Report |
| Claremont Nh Water Quality Report 2026 | View Report |
| Claymont Nh Water Quality Report 2026 | View Report |
| Colebrook Nh Water Quality Report 2026 | View Report |
| Columbia Nh Water Quality Report 2026 | View Report |
| Concord Nh Water Quality Report 2026 | View Report |
| Contoocook Nh Water Quality Report 2026 | View Report |
| Conway Nh Water Quality Report 2026 | View Report |
| Dalton Nh Water Quality Report 2026 | View Report |
| Danville Nh Water Quality Report 2026 | View Report |
| Deerfield Nh Water Quality Report 2026 | View Report |
| Deering Nh Water Quality Report 2026 | View Report |
| Derry Nh Water Quality Report 2026 | View Report |
| Dorchester Nh Water Quality Report 2026 | View Report |
| Dover Nh Water Quality Report 2026 | View Report |
| Dunbarton Nh Water Quality Report 2026 | View Report |
| Durham Nh Water Quality Report 2026 | View Report |
| E Kingston Nh Water Quality Report 2026 | View Report |
| E Wakefield Nh Water Quality Report 2026 | View Report |
| East Andover Nh Water Quality Report 2026 | View Report |
| East Hampstead Nh Water Quality Report 2026 | View Report |
| Enfield Nh Water Quality Report 2026 | View Report |
| Epping Nh Water Quality Report 2026 | View Report |
| Epsom Nh Water Quality Report 2026 | View Report |
| Errol Nh Water Quality Report 2026 | View Report |
| Exeter Nh Water Quality Report 2026 | View Report |
| Fitzwilliam Nh Water Quality Report 2026 | View Report |
| Francestown Nh Water Quality Report 2026 | View Report |
| Franconia Nh Water Quality Report 2026 | View Report |
| Franklin Nh Water Quality Report 2026 | View Report |
| Freedom Nh Water Quality Report 2026 | View Report |
| Fremont Nh Water Quality Report 2026 | View Report |
| Gilford Nh Water Quality Report 2026 | View Report |
| Glen Nh Water Quality Report 2026 | View Report |
| Glencliff Nh Water Quality Report 2026 | View Report |
| Goffstown Nh Water Quality Report 2026 | View Report |
| Gorham Nh Water Quality Report 2026 | View Report |
| Grafton Nh Water Quality Report 2026 | View Report |
| Grantham Nh Water Quality Report 2026 | View Report |
| Great Neck Nh Water Quality Report 2026 | View Report |
| Greenfield Nh Water Quality Report 2026 | View Report |
| Greenville Nh Water Quality Report 2026 | View Report |
| Groveland Nh Water Quality Report 2026 | View Report |
| Groveton Nh Water Quality Report 2026 | View Report |
| Hales Location Nh Water Quality Report 2026 | View Report |
| Hampton Nh Water Quality Report 2026 | View Report |
| Hancock Nh Water Quality Report 2026 | View Report |
| Hanover Nh Water Quality Report 2026 | View Report |
| Harrisville Nh Water Quality Report 2026 | View Report |
| Haverhill Nh Water Quality Report 2026 | View Report |
| Hebron Nh Water Quality Report 2026 | View Report |
| Henniker Nh Water Quality Report 2026 | View Report |
| Hill Nh Water Quality Report 2026 | View Report |
| Hillsboro Nh Water Quality Report 2026 | View Report |
| Hillsborough Nh Water Quality Report 2026 | View Report |
| Hinsdale Nh Water Quality Report 2026 | View Report |
| Holderness Nh Water Quality Report 2026 | View Report |
| Hollis Nh Water Quality Report 2026 | View Report |
| Hooksett Nh Water Quality Report 2026 | View Report |
| Hopkinton Nh Water Quality Report 2026 | View Report |
| Hudson Nh Water Quality Report 2026 | View Report |
| Intervale Nh Water Quality Report 2026 | View Report |
| Jackson Nh Water Quality Report 2026 | View Report |
| Jaffrey Nh Water Quality Report 2026 | View Report |
| Keene Nh Water Quality Report 2026 | View Report |
| Kingston Nh Water Quality Report 2026 | View Report |
| Laconia Nh Water Quality Report 2026 | View Report |
| Lancaster Nh Water Quality Report 2026 | View Report |
| Las Vegas Nh Water Quality Report 2026 | View Report |
| Lawrence Nh Water Quality Report 2026 | View Report |
| Lebanon Nh Water Quality Report 2026 | View Report |
| Lee Nh Water Quality Report 2026 | View Report |
| Lincoln Nh Water Quality Report 2026 | View Report |
| Lisbon Nh Water Quality Report 2026 | View Report |
| Litchfield Nh Water Quality Report 2026 | View Report |
| Littleton Nh Water Quality Report 2026 | View Report |
| Londonderry Nh Nh Water Quality Report 2026 | View Report |
| Londonderry Nh Water Quality Report 2026 | View Report |
| Loudon Nh Water Quality Report 2026 | View Report |
| Lowell Nh Water Quality Report 2026 | View Report |
| Lunenburg Nh Water Quality Report 2026 | View Report |
| Lyme Nh Water Quality Report 2026 | View Report |
| Lynn Nh Water Quality Report 2026 | View Report |
| Madbury Nh Water Quality Report 2026 | View Report |
| Madison Nh Water Quality Report 2026 | View Report |
| Manchester Nh Water Quality Report 2026 | View Report |
| Mansfield Nh Water Quality Report 2026 | View Report |
| Marblehead Nh Water Quality Report 2026 | View Report |
| Marlborough Nh Water Quality Report 2026 | View Report |
| Medford Nh Water Quality Report 2026 | View Report |
| Meredith Nh Water Quality Report 2026 | View Report |
| Meriden Nh Water Quality Report 2026 | View Report |
| Merrimack Nh Water Quality Report 2026 | View Report |
| Methuen Nh Water Quality Report 2026 | View Report |
| Milan Nh Water Quality Report 2026 | View Report |
| Milton Nh Water Quality Report 2026 | View Report |
| Minneapolis Nh Water Quality Report 2026 | View Report |
| Mirror Lake Nh Water Quality Report 2026 | View Report |
| Monroe Nh Water Quality Report 2026 | View Report |
| Moultonboro Nh Water Quality Report 2026 | View Report |
| Moultonborough Nh Water Quality Report 2026 | View Report |
| N Conway Nh Water Quality Report 2026 | View Report |
| N Quincy Nh Water Quality Report 2026 | View Report |
| N Stratford Nh Water Quality Report 2026 | View Report |
| N Swanzey Nh Water Quality Report 2026 | View Report |
| N Walpole Nh Water Quality Report 2026 | View Report |
| N Woodstock Nh Water Quality Report 2026 | View Report |
| Nashua Nh Water Quality Report 2026 | View Report |
| New Boston Nh Water Quality Report 2026 | View Report |
| New Durham Nh Water Quality Report 2026 | View Report |
| New Hampton Nh Water Quality Report 2026 | View Report |
| New Ipswich Nh Water Quality Report 2026 | View Report |
| New London Nh Water Quality Report 2026 | View Report |
| Newbury Nh Water Quality Report 2026 | View Report |
| Newmarket Nh Water Quality Report 2026 | View Report |
| Newport Nh Water Quality Report 2026 | View Report |
| Newton Nh Water Quality Report 2026 | View Report |
| No Hampton Nh Water Quality Report 2026 | View Report |
| North Conway Nh Water Quality Report 2026 | View Report |
| North Haverhill Nh Water Quality Report 2026 | View Report |
| North Woodstock Nh Water Quality Report 2026 | View Report |
| Northfield Nh Water Quality Report 2026 | View Report |
| Northumberland Nh Water Quality Report 2026 | View Report |
| Norwell Nh Water Quality Report 2026 | View Report |
| Nottingham Nh Water Quality Report 2026 | View Report |
| Orford Nh Water Quality Report 2026 | View Report |
| Ossipee Nh Water Quality Report 2026 | View Report |
| Pawtucket Nh Water Quality Report 2026 | View Report |
| Peace Dale Nh Water Quality Report 2026 | View Report |
| Pelham Nh Water Quality Report 2026 | View Report |
| Pembroke Nh Water Quality Report 2026 | View Report |
| Peterborough Nh Water Quality Report 2026 | View Report |
| Pike Nh Water Quality Report 2026 | View Report |
| Pittsburg Nh Water Quality Report 2026 | View Report |
| Pittsfield Nh Water Quality Report 2026 | View Report |
| Plainville Nh Water Quality Report 2026 | View Report |
| Plaistow Nh Water Quality Report 2026 | View Report |
| Plymouth Nh Water Quality Report 2026 | View Report |
| Portland Nh Water Quality Report 2026 | View Report |
| Portsmouth Nh Water Quality Report 2026 | View Report |
| Prospect Nh Water Quality Report 2026 | View Report |
| Quincy Nh Water Quality Report 2026 | View Report |
| Randolph Nh Water Quality Report 2026 | View Report |
| Raymond Nh Water Quality Report 2026 | View Report |
| Rindge Nh Water Quality Report 2026 | View Report |
| Rochester Nh Water Quality Report 2026 | View Report |
| Rollinsford Nh Water Quality Report 2026 | View Report |
| Roseland Nh Water Quality Report 2026 | View Report |
| Rye Nh Water Quality Report 2026 | View Report |
| Salem Nh Water Quality Report 2026 | View Report |
| San Francisco Nh Water Quality Report 2026 | View Report |
| Sanbornton Nh Water Quality Report 2026 | View Report |
| Sanbornville Nh Water Quality Report 2026 | View Report |
| Sandown Nh Water Quality Report 2026 | View Report |
| Sarasota Nh Water Quality Report 2026 | View Report |
| Seabrook Nh Water Quality Report 2026 | View Report |
| Somersworth Nh Water Quality Report 2026 | View Report |
| Southboro Nh Water Quality Report 2026 | View Report |
| Stewartstown Nh Water Quality Report 2026 | View Report |
| Stratham Nh Water Quality Report 2026 | View Report |
| Sunapee Nh Water Quality Report 2026 | View Report |
| Suncook Nh Water Quality Report 2026 | View Report |
| Surry Nh Water Quality Report 2026 | View Report |
| Swanzey Nh Water Quality Report 2026 | View Report |
| Tamworth Nh Water Quality Report 2026 | View Report |
| Thornton Nh Water Quality Report 2026 | View Report |
| Tilton Nh Water Quality Report 2026 | View Report |
| Troy Nh Water Quality Report 2026 | View Report |
| Tuftonboro Nh Water Quality Report 2026 | View Report |
| Twin Mountain Nh Water Quality Report 2026 | View Report |
| Unity Nh Water Quality Report 2026 | View Report |
| W Stewartstown Nh Water Quality Report 2026 | View Report |
| Walpole Nh Water Quality Report 2026 | View Report |
| Waltham Nh Water Quality Report 2026 | View Report |
| Warner Nh Water Quality Report 2026 | View Report |
| Warren Nh Water Quality Report 2026 | View Report |
| Washington Nh Water Quality Report 2026 | View Report |
| Waterville Valley Nh Water Quality Report 2026 | View Report |
| Weare Nh Water Quality Report 2026 | View Report |
| Webster Nh Water Quality Report 2026 | View Report |
| West Stewartstown Nh Water Quality Report 2026 | View Report |
| West Swanzey Nh Water Quality Report 2026 | View Report |
| West Vancouver Nh Water Quality Report 2026 | View Report |
| Westmoreland Nh Water Quality Report 2026 | View Report |
| Whitefield Nh Water Quality Report 2026 | View Report |
| Wilmot Nh Water Quality Report 2026 | View Report |
| Wilton Nh Water Quality Report 2026 | View Report |
| Winchester Nh Water Quality Report 2026 | View Report |
| Windham Nh Water Quality Report 2026 | View Report |
| Windsor Nh Water Quality Report 2026 | View Report |
| Woburn Nh Water Quality Report 2026 | View Report |
| Wolfeboro Nh Water Quality Report 2026 | View Report |
| Woodstock Nh Water Quality Report 2026 | View Report |
| Woodsville Nh Water Quality Report 2026 | View Report |
| Woonsocket Nh Water Quality Report 2026 | View Report |
What Does This Mean For You?
Detecting Nitrates in your water supply does not necessarily mean immediate danger, but long-term exposure -- even at low levels -- carries measurable health risk. Reverse osmosis is the most effective method for removing nitrates from drinking water.
Our recommendation: View Nitrates filters certified for New Hampshire water conditions or take our free Water Finder Quiz to get a personalized recommendation.
Filter Nitrates From Your New Hampshire Tap Water
PureWaterGuys carries NSF-certified filters proven to reduce Nitrates and other contaminants found in New Hampshire water.
Shop Nitrates Filters Take the Water QuizFrequently Asked Questions
What is Nitrates?
High nitrate levels cause methemoglobinemia (blue baby syndrome) in infants. EPA MCL is 10 mg/L.
Is New Hampshire tap water safe to drink?
Water quality varies by city. Of the New Hampshire systems we analyzed, 232 detected Nitrates. Most levels are below EPA action thresholds, but long-term low-level exposure carries health risk. Check your city's report above or use a certified home filter as a precaution.
What filter removes Nitrates from tap water?
Reverse osmosis is the most effective method for removing nitrates from drinking water. See our Nitrates filter options.
Data sourced from EPA-mandated annual water quality reports (Consumer Confidence Reports). Last updated: 2026. Not all systems are required to test for every contaminant.