PlainWater
Counties → New Hampshire

Hillsborough County, New Hampshire

Water Systems
280
Population Served
336,342
Total Violations
17,880
3,943 health-based
PFAS Detected
5
of 9 tested

Violation Analysis

88.6%
Systems with Violations
63.9
Avg Violations per System
22.1%
Health-Based Violations

Water Source Types

GW
38 systems (14%)
SW
12 systems (4%)

PFAS Contamination

9
Systems Tested
5
PFAS Detected
55.6%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Hillsborough New Hampshire water systems by violation status, EPA SDWIS records.

No violations on record (1) One or more violations (49)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Manchester Water Works 123,500 6 Detected
Pennichuck Water Works 89,073 5 Clean
Merrimack Village Dist 25,500 170 Clean
Hudson Water Dept 16,700 10 Detected
Milford Water Utilities Dept 9,500 148 Clean
Litchfield 7,000 2 Detected
Peterborough Water Works 4,500 123 Clean
Little Pond Estates 3,000 2 Detected
Goffstown Village Pct 3,000 63 -
Hillsborough Water Works 2,000 737 -
Hollis Sch Dist 2,000 26 -
Wilton Water Works 1,790 104 -
Crotched Mountain Ski Area 1,500 18 -
Emerald Lake 1,300 179 -
Powder Hill 1,155 14 -
Hillsborough Cnty Yth Cntr 1,150 8 -
Grasmere Water Pct/Main 1,125 41 -
Greenville Water Dept 1,100 32 -
Hollis Brookline Hs 980 149 -
470 Mobil 950 16 -
Williamsburg 928 46 -
Antrim Sewer and Water Dept 920 58 -
McDonalds Restaurant 900 53 -
Cabot Preserve 878 14 -
Bennington Water Dept 775 65 -
Dunkin Donuts/Baskin Robbins 775 129 -
John Stark Reg High Sch 698 25 -
Cold Springs Campground/Ph 657 8 -
Center Woods Elementary Sch 620 26 -
Riley Field Complex 600 8 -
New Boston Elementary Sch 598 4 -
Greenfield St Pk Pump House 550 30 -
Weare Middle Sch 500 8 -
Camp Tevya 497 35 -
Bedford White Ave Irving 475 65 -
Greenville Est Village Dist 472 98 -
Highbridge Hill Elem Sch 465 0 -
Camp Foster 460 10 -
Hancock Water Works 450 141 -
Dunkin Donuts 450 45 -
Badger Hill 438 2 -
Camp Young Judaea/the Grove 415 4 -
Boynton Middle Sch 410 160 -
Capt Samuel Douglass Academy 358 165 -
Murphys Taproom/Carriage Hse 350 68 -
7 Eleven 350 14 -
Mascenic Regional High Sch 350 134 -
Pelham Veterans Memorial Park 335 20 -
Richard Maghakian Memorial Sch 327 3 -
All Seasons Condos 325 51 -

Other Counties in New Hampshire

Rockingham County
559 systems · 273,232 served · 32,389 violations
Merrimack County
247 systems · 124,101 served · 14,635 violations
Strafford County
132 systems · 107,387 served · 8,921 violations
Grafton County
269 systems · 101,638 served · 20,540 violations
Carroll County
363 systems · 80,560 served · 21,120 violations
Belknap County
255 systems · 74,926 served · 16,111 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Hillsborough County? ▼
Hillsborough County has 17,880 total drinking water violations across 280 water systems, of which 3,943 are health-based violations. 88.6% of systems have at least one violation.
How many people get water from Hillsborough County systems? ▼
Water systems in Hillsborough County serve approximately 336,342 people through 280 public water systems.
Has PFAS been detected in Hillsborough County water? ▼
Of 9 water systems tested for PFAS in Hillsborough County, 5 had PFAS detected (55.6% detection rate).
What types of water sources supply Hillsborough County? ▼
Water systems in Hillsborough County use GW (38 systems), SW (12 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 22.1% of Hillsborough County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.