PlainWater
Counties → Connecticut

Hartford County, Connecticut

SDWIS compliance plate

Sheet CT003 · Hartford County 219 sys · 20,244 viol · #75/3254

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

  • VIOL-SEVERE 97.3% flagged
  • HEALTH-LOW 6.5% health
  • RANK-TOP #75/3254
  • PHOTO-FINISH ±0.8 pp
  • PFAS-HIGH 78.6% detect
  • SRC-GW GW lead 91%
  • SYS-LARGE 219 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Fairfield County ( -0.8 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Hartford County ranks #75 of 3,254 counties by people served, and #1 of 8 counties in Connecticut. See methodology · corpus placement.

Hartford County standing, mid-flagged corpus third

Flagged-system rate 97.3% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 6.5% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 78.6% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #75 of 3,254 · #1 of 8 in Connecticut.

Flagged-rate neighbourhood around Hartford County

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

0% 20% 40% 60% 80% 100% New London · lowest Litchfield · near 91.4% 93.5% 94.3% 96.2% 96.4% 97.3%

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

Water Systems

System Name Population Violations PFAS
Metropolitan District Commission 390,887 3 Clean
Ctwc - Northern Reg-Western System 101,313 406 Detected
New Britain Water Department 73,534 34 Clean
Bristol Water Department 52,079 269 Detected
Manchester Water Department 51,198 31 Detected
Southington Water Department 43,069 1,028 Detected
Hazardville Water Company 18,544 119 Detected
Aquarion-Plainville Regional 18,231 63 Detected
Ctwc - Unionville System 14,693 27 Detected
Aquarion-Simsbury Regional 14,691 200 Detected
Avon Water Co 11,590 476 Detected
Kensington Fire District 7,553 96 Clean
Ctwc - Naugatuck Reg-Collinsville Sys 6,324 66 Detected
Berlin Water Control Commission 5,128 677 Detected
Worthington Fire District 2,875 57 -
Connecticut Correctional Institute 2,385 460 -
Salmon Brook District Water Dept 2,151 127 -
Tariffville Fire District Water Dept 1,477 112 -
Aquarion-Marlborough 1,348 633 -
Talcott Mountain S.p. 793 22 -
Lake Garda School 715 27 -
Penwood State Park/Main Park Well 700 13 -
Cherry Brook School 615 260 -
Aquarion-Suffield 595 121 -
Elisabeth M. Bennet Academy 536 72 -
Eastbury School 523 98 -
Ctwc - Redwood Farms Division 424 24 -
Wells Road Intermediate School 405 126 -
The Masters School 372 173 -
Aquarion-North Mountain 370 4 -
Turkey Hill of East Granby, LLC 360 153 -
Gqc Well Commission 360 340 -
Kelly Lane Primary School 357 21 -
Newington VA Medical Center-Building 2E 335 6 -
Ethel Walker School 325 567 -
Hartland Elem Sch & Town Bldgs 300 392 -
Apple Rehab 238 12 -
Ctwc - Chimney Hill 227 2 -
Manchester Cong. of Jehovahs Witnesses 222 8 -
Cannabis Retailer at 195 Albany Turnpike 214 7 -
Old Newgate Ridge Water Company Inc 208 166 -
Winding Trails Recreation Assn - Upper 207 17 -
Winding Trails Recreation Assn - Lower 207 4 -
Shaker Heights Water Company 172 41 -
Ctwc - Sachem Village Condo 166 9 -
Marlborough Health Care Center, Inc 165 142 -
Chelsea Common Condominium Association 126 27 -
Ccarc Inc. 125 19 -
Cadence Academy 112 738 -
Ctwc - Marlborough Gardens 110 38 -

Compare beyond Connecticut

Mid-flagged peers for Hartford County

Cross-state counties nearest Hartford County on flagged-system share (97.3%) and cumulative violation count (20,244). 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.