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Counties → Connecticut

Fairfield County, Connecticut

SDWIS compliance plate

Sheet CT001 · Fairfield County 336 sys · 42,084 viol · #82/3254

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

  • VIOL-SEVERE 96.4% flagged
  • HEALTH-LOW 11.4% health
  • RANK-TOP #82/3254
  • PHOTO-FINISH ±0.2 pp
  • PFAS-HIGH 84.6% detect
  • SRC-GW GW lead 94%
  • SYS-LARGE 336 systems
  • BOOK-FULL 7/7 fields

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

According to EPA SDWIS county population served used on /counties, Fairfield County ranks #82 of 3,254 counties by people served, and #2 of 8 counties in Connecticut. See methodology · corpus placement.

Fairfield County standing, mid-flagged corpus third

Flagged-system rate 96.4% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 11.4% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 84.6% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #82 of 3,254 · #2 of 8 in Connecticut.

Flagged-rate neighbourhood around Fairfield County

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

0% 20% 40% 60% 80% 100% New London · lowest New Haven · near Fairfield · this county 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
Aquarion-Eastern Fairfield County 351,756 585 Detected
Aquarion-Stamford 119,214 136 Detected
Danbury Water Department 62,055 326 Detected
Aquarion-Greenwich 53,297 114 Detected
South Norwalk Electric & Water 42,000 215 Clean
Norwalk First Taxing District 40,256 6 Detected
Aquarion-Darien 18,737 8 Detected
Aquarion-New Milford Regional 13,331 126 Detected
Aquarion-New Canaan 10,097 30 Detected
Bethel Water Dept 9,507 248 Detected
Aquarion-Ridgefield 7,476 93 Detected
Aquarion-Newtown Regional 6,054 38 Detected
Fairfield Hills 2,610 64 -
Weston Schools and Municipal Buildings 2,600 493 -
Ridgefield High and Middle School 2,575 100 -
New Fairfield High/Middle School 1,791 576 -
Consolidated & Meeting House Hill School 1,425 294 -
Candlewood Shores Tax District 1,315 382 -
Brookfield High School 995 53 -
Aquarion-Ridgefield Knolls 958 228 -
Whisconier Middle School 950 142 -
Joel Barlow Regional High School 890 139 -
Redding Elementary School 811 55 -
Greenwich American Center 800 288 Clean
Lake Waubeeka Association 712 202 -
Aquarion-Ball Pond 629 86 -
Brunswick School (Lower & Lower Middle) 567 85 -
Candlewood Knolls Water Authority 524 478 -
Head O Meadow Elementary School 506 286 -
Stone Bridge Center for Health & Rehab 504 303 -
St Lukes School Athletic Center 500 17 -
Branchville School 488 6 -
Fairview Country Club 435 164 -
John Read Middle School 430 101 -
Sherman Elementary School 430 79 -
Farmingville Elementary School 428 0 -
Aspetuck Valley Country Club-Clubhouse 415 10 -
Aquarion-New Fairfield 406 114 -
St Lukes School 405 248 -
Nordan LLC 400 14 -
Stony Hill Village Condominium Assn 392 456 -
Aqua Vista Assoc, Inc 388 137 -
Church of Latter Day Saints 373 6 -
Indian Well S.p./South Well 367 32 -
Knollcrest Tax District 356 163 -
Whitby School 350 633 -
Aquarion-Timber Trails 310 44 -
Aquarion-Possum Ridge 307 244 -
Arrowhead Point Homeowners Assn Inc. 296 53 -
Brunswick School (Upper Middle) 295 34 -

Compare beyond Connecticut

Mid-flagged peers for Fairfield County

Cross-state counties nearest Fairfield County on flagged-system share (96.4%) and cumulative violation count (42,084). 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.