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Counties → New Hampshire

Hillsborough County, New Hampshire

SDWIS compliance plate

Sheet NH011 · Hillsborough County 280 sys · 17,880 viol · #202/3254

VIOL-SEVERE · HEALTH-MID · RANK-TOP · PHOTO-FINISH · PFAS-MID · SRC-GW · SYS-LARGE · BOOK-FULL

  • VIOL-SEVERE 88.6% flagged
  • HEALTH-MID 22.1% health
  • RANK-TOP #202/3254
  • PHOTO-FINISH ±0.6 pp
  • PFAS-MID 44.4% detect
  • SRC-GW GW lead 95%
  • SYS-LARGE 280 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Rockingham County ( -0.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Hillsborough County ranks #202 of 3,254 counties by people served, and #1 of 10 counties in New Hampshire. See methodology · corpus placement.

Hillsborough County standing, lower-flagged corpus third

Flagged-system rate 88.6% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 22.1% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 44.4% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #202 of 3,254 · #1 of 10 in New Hampshire.

Flagged-rate neighbourhood around Hillsborough County

Lowest/highest poles plus in-state counties nearest Hillsborough County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Sullivan · lowest Rockingham · near Belknap · near Grafton · highest 86.2% 87.1% 88% 88.6% 89.8% 90.9% 94.4%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

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 -

Compare beyond New Hampshire

Lower-flagged peers for Hillsborough County

Cross-state counties nearest Hillsborough County on flagged-system share (88.6%) and cumulative violation count (17,880). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - 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

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.