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Counties → New Jersey

Middlesex County, New Jersey

SDWIS compliance plate

Sheet NJ023 · Middlesex County 35 sys · 2,949 viol · #103/3254

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

  • VIOL-SEVERE 94.3% flagged
  • HEALTH-LOW 13.6% health
  • RANK-TOP #103/3254
  • PHOTO-FINISH ±0.2 pp
  • PFAS-HIGH 92.3% detect
  • SRC-GW GW lead 63%
  • SYS-SMALL 35 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Gloucester County (+ 0.2 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Middlesex County ranks #103 of 3,254 counties by people served, and #7 of 21 counties in New Jersey. See methodology · corpus placement.

Middlesex County standing, mid-flagged corpus third

Flagged-system rate 94.3% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 13.6% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 92.3% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #103 of 3,254 · #7 of 21 in New Jersey.

Flagged-rate neighbourhood around Middlesex County

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

0% 20% 40% 60% 80% 100% Ocean · lowest Gloucester · near Warren · near Hudson · highest 91.1% 94.3% 94.5% 94.8% 95.1% 95.6% 100%

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

Water Systems

System Name Population Violations PFAS
Middlesex Water Company 233,376 87 Detected
Old Bridge Mua 68,000 56 Detected
New Brunswick W Dept 55,000 797 Detected
Perth Amboy Water Department 52,328 192 Detected
East Brunswick Water Utility 48,474 83 Detected
Sayreville W Dept 45,345 182 Detected
North Brunswick W Dept 43,905 75 Clean
Monroe Twp Utility Department 36,000 538 Detected
Edison Water Co 35,000 50 Detected
South River W Dept 16,000 100 Detected
Highland Park W Dept 14,000 23 Detected
Spotswood W Dept 8,300 87 Detected
Milltown W Dept 7,000 136 Detected
Helmetta Water Dept 2,000 88 -
Valero Gas Station 610 18 -
Monroe Sports Center 371 14 -
Bakers American Bar & Grille 365 7 -
Springwood Swim Club 365 34 -
Chinmaya Mission Tri State Center 352 4 -
St Davids Episcopal Church 303 27 -
Lake Nelson School 300 43 -
St Stephens Mar Thoma Church 200 78 -
Qr Farrington DC LLC 175 0 -
Keystone Plastics Inc 120 64 -
Cranbury Animal Hospital 114 3 -
Cranbury Buick Gmc 110 60 -
M Hegarty & J Vincent Scalia Funerals 104 6 -
Make a Wish 88 2 -
Floral Park Cemetery 62 3 -
Valvoline Instant Oil Change 60 39 -
Foley Inc 47 13 -
Union Hill Gun Club 40 7 -
Holland Greenhouse 38 30 -
New Jersey Dental Assoc 33 3 -
Recoil Inc 30 0 -

Compare beyond New Jersey

Mid-flagged peers for Middlesex County

Cross-state counties nearest Middlesex County on flagged-system share (94.3%) and cumulative violation count (2,949). 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.