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Counties → New Hampshire

Coos County, New Hampshire

SDWIS compliance plate

Sheet NH007 · Coos County 113 sys · 7,377 viol · #1085/3254

VIOL-SEVERE · HEALTH-LOW · RANK-UPPER · PHOTO-FINISH · PFAS-CLEAN · SRC-GW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 91.2% flagged
  • HEALTH-LOW 12.7% health
  • RANK-UPPER #1085/3254
  • PHOTO-FINISH ±0.2 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 97%
  • SYS-MID 113 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Strafford County ( -0.2 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Coos County ranks #1,085 of 3,254 counties by people served, and #9 of 10 counties in New Hampshire. See methodology · corpus placement.

Coos County standing, lower-flagged corpus third

Flagged-system rate 91.2% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 12.7% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #1,085 of 3,254 · #9 of 10 in New Hampshire.

Flagged-rate neighbourhood around Coos County

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

0% 20% 40% 60% 80% 100% Sullivan · lowest Strafford · near Carroll · near Grafton · highest 86.2% 89.8% 90.9% 91.2% 91.7% 92.7% 94.4%

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

Water Systems

System Name Population Violations PFAS
Berlin Water Works 9,575 11 Clean
Groveton Water Sys 2,650 79 -
Gorham Water and Sewer Dept 2,630 85 -
Lancaster Water Dept 2,450 217 -
Whitefield Water 1,640 50 -
Colebrook Water Works 1,300 173 -
Rogers Campground 1,250 51 -
Mt Washington State Park 1,200 16 -
Rosebrook Water 1,050 172 -
Santas Village 999 6 -
Mt Washington Cog Rw/Peppersas 999 16 -
Wildcat Mountain Ski Area 900 8 -
Carroll Water Works 875 14 -
Santas Village Snack Bar 700 8 -
Dolly Copp Campground 600 41 -
Auto Road Lodge 500 9 -
White Birches Campground South 480 21 -
White Mtn Regional Hs 453 59 -
Beech Hill Campground 448 47 -
W Stewartstown Water Pct 428 81 -
Town and Country Inn/Resort 383 4 -
Buck Rub Pizza Pub and Lodge 359 48 -
Israel River Campground 300 13 -
Santas Village/Elfs Lodge 300 0 -
Mountain Lake Campground 300 25 -
North Stratford Water Dept 300 197 -
Lantern Resort 260 54 -
Jericho Mountain State Park 250 8 -
Jefferson Campground 250 60 -
Timberland Cmpgrnd and RV Prk 250 8 -
Pittsburg Water Dept 233 34 -
Colebrook Rest Area 200 14 -
Log Haven Campground 200 76 -
Hermit Lake Shelter Site 200 17 -
Mountainview Grand Resort 200 0 -
Cabot Inn and Suites 190 23 -
Tall Timber Lodge and Cabins 190 63 -
Errol Water Works/West 183 973 -
Water Wheel Breakfast/Gift Hse 180 45 -
Glen House Hotel 165 3 -
Sugarloaf I/II Cpg 158 30 -
Milan Village Sch 151 83 -
Burns Lake Campground 150 18 -
Sugarloaf II Cpg/Site 24 141 13 -
Amc Highland Center 138 16 -
Pittsburgs Hidden Acres 130 10 -
Old Corner Store 125 14 -
Spruce Cone Park 125 78 -
Lodge at Bretton Woods 121 8 -
Umbagog Lake Stp Cmpgrnd 120 55 -

Compare beyond New Hampshire

Lower-flagged peers for Coos County

Cross-state counties nearest Coos County on flagged-system share (91.2%) and cumulative violation count (7,377). 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.