PlainWater
Counties → New Hampshire

Rockingham County, New Hampshire

SDWIS compliance plate

Sheet NH015 · Rockingham County 559 sys · 32,389 viol · #257/3254

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

  • VIOL-SEVERE 88.0% flagged
  • HEALTH-MID 22.6% health
  • RANK-TOP #257/3254
  • PHOTO-FINISH ±0.6 pp
  • PFAS-HIGH 91.7% detect
  • SRC-GW GW lead 97%
  • SYS-LARGE 559 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Hillsborough County (+ 0.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Rockingham County ranks #257 of 3,254 counties by people served, and #2 of 10 counties in New Hampshire. See methodology · corpus placement.

Rockingham County standing, lower-flagged corpus third

Flagged-system rate 88.0% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 22.6% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 91.7% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #257 of 3,254 · #2 of 10 in New Hampshire.

Flagged-rate neighbourhood around Rockingham County

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

0% 20% 40% 60% 80% 100% Sullivan · lowest Rockingham · this county Belknap · near 86.2% 87.1% 88% 88.6% 89.8% 94.4%

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

Water Systems

System Name Population Violations PFAS
Aquarion Water/NH 34,000 19 Detected
Portsmouth Water Works 33,000 43 Detected
Salem Water Dept 21,000 33 Detected
Derry Water Dept 17,210 12 Detected
Seabrook Water Dept 14,000 1,029 Detected
Exeter Water Dept 12,236 268 Detected
Pease Trade Port 9,900 7 Detected
Hampstead Area Water 6,953 174 Detected
Londonderry 5,380 8 Detected
Newmarket Water Works 5,030 251 Clean
Rye Water Dist 4,300 20 Detected
Raymond Water Dept 3,300 28 Detected
Exeter High Sch 1,605 8 -
Epping Water and Sewer Dept 1,600 32 -
Drew Woods 1,408 8 -
Rockingham County Complex 1,387 15 -
Golden Brook Sch 1,314 20 -
Timberlane Regional Hs 1,137 50 -
Windham High Sch 1,110 18 -
Candia First Stoppe 999 12 -
Wakeda Campground 999 0 -
Pawtuckaway St Pk/Admn Complex 999 30 -
Pawtuckaway St Pk/Horse Island 999 37 -
Pawtuckaway St Pk/Day Use Area 999 32 -
Exeter River Mobile Home Park 980 76 -
Great Bay Camping/Store/Deli 925 20 -
New Castle Water Works 910 115 -
Dunkin Donuts 900 14 -
Plaistow Petro King 900 21 -
Timberlane Middle Sch 897 18 -
Sanborn Regional Middle/High 875 8 -
Brook Park Ests 875 7 -
Century Village Condos 875 101 -
Auburn Dunkin Donuts 800 8 -
Nouria 1167 800 18 -
Tuxbury Pond RV Resort 800 26 -
Dunkin Donuts /Pc 346676 800 8 -
Coe Brown Academy 765 190 -
Coe Brown Smith Hall 765 8 -
YMCA Camp Lincoln/Pavilion 750 95 -
YMCA Camp Lincoln/Lakeside 750 43 -
Coe Brown Athletic Field 750 34 -
Auburn Village Sch 732 99 -
Dunkin Donuts 700 4 -
Vlg of Northwood Rdg Wtr Dist 688 88 -
Deerfield Community Sch 650 92 -
Stratham Memorial Sch 625 10 -
Green Hills Ests 620 7 -
Mobil on the Run 615 23 -
Chester Academy 607 0 -

Compare beyond New Hampshire

Lower-flagged peers for Rockingham County

Cross-state counties nearest Rockingham County on flagged-system share (88.0%) and cumulative violation count (32,389). 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.