PlainWater
Counties → Connecticut

Tolland County, Connecticut

SDWIS compliance plate

Sheet CT013 · Tolland County 293 sys · 17,053 viol · #840/3254

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

  • VIOL-SEVERE 91.8% flagged
  • HEALTH-LOW 11.3% health
  • RANK-UPPER #840/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-HIGH 50.0% detect
  • SRC-GW GW lead 98%
  • SYS-LARGE 293 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Windham County (+ 0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Tolland County ranks #840 of 3,254 counties by people served, and #8 of 8 counties in Connecticut. See methodology · corpus placement.

Tolland County standing, lower-flagged corpus third

Flagged-system rate 91.8% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 11.3% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 50.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #840 of 3,254 · #8 of 8 in Connecticut.

Flagged-rate neighbourhood around Tolland County

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

0% 20% 40% 60% 80% 100% New London · lowest Windham · near New Haven · near 91.4% 91.8% 92.2% 93.5% 94.3% 97.3%

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

Water Systems

System Name Population Violations PFAS
University of Connecticut - Main Campus 27,199 66 Detected
Ctwc - Hebron Center Division 1,927 2 -
Coventry High & Nathan Hale Schools 1,252 18 -
Tolland Water Department 1,251 19 -
Ctwc - Amston Lake Division 910 304 -
Horace Porter School 797 100 -
Bolton Center School (K-8) 756 59 -
Ctwc - Uconn South Eagleville Div. 750 0 -
Mansfield Middle School 715 38 -
Ctwc - Coventry Hills Div 700 27 Clean
Mansfield Elementary School 688 30 -
George Hersey Robertson School 573 9 -
Coventry Grammar School 558 100 -
Ctwc - South Coventry System 501 232 -
Woodhaven Apartments 489 78 -
Ctwc - Northern Region-Lakeview Terrace 472 12 -
Hebron Elementary School 450 21 -
Vernon Village Inc. 430 31 -
Stafford Hollow Water Association 429 43 -
Gilead Hill School 391 9 -
Andover Elementary School 381 71 -
Hazardville - Rye Hill System 352 4 -
Willington Senior Center & Housing 327 9 -
Knollwood Apartments 312 108 -
Ctwc - General Water Division 306 22 -
Bolton High School 304 81 -
Justice Education Center Camp Inspire 300 69 -
Walden Apartments 276 167 -
Crystal Lake School 275 60 -
Ctwc - Northern Region-Lakewood 256 143 -
Johnson Memorial Hospital, Inc 250 172 -
Ctwc - Uconn Hunting Lodge Div. 234 0 -
Ctwc - Pilgrim Hills Division 229 23 -
Ctwc - London Park Division 221 29 -
Mansfield Library Buchanan Center 217 6 -
Woodland Summit Community Water Assn 216 58 -
Ivy Woods 207 151 -
Tolland Water Dept - Torry Road 204 16 -
1657 Boston Turnpike - Coventry 203 81 -
Fed Ex Ground 200 111 -
Carriage House Apartments 196 97 -
Cornerstone of Columbia 193 0 -
Ctwc - Northern Reg-Llynwood System 192 148 -
White Oak Condominiums 192 51 -
Renwood Apartments 190 144 -
Discovery Zone Learning Cntr Columbia 189 29 -
Ctwc - Riversedge Division 179 25 -
Orchard Acres Association 176 61 -
Baxter Farms Community Water Assoc 175 31 -
Ctwc - Crystal Springs Div. 169 9 -

Compare beyond Connecticut

Lower-flagged peers for Tolland County

Cross-state counties nearest Tolland County on flagged-system share (91.8%) and cumulative violation count (17,053). 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.