Tolland County, Connecticut — public water systems
At a glance
296 active public water systems are filed under Tolland County, Connecticut in EPA's SDWIS records, together reporting 59,796 people served. The largest is University of Connecticut - Main Campus, which reports serving 27,199 people. 69 are community water systems serving people where they live; the other 227 are non-community systems, such as schools, workplaces, campgrounds and gas stations with their own supply.
Dataset updated . Source: EPA SDWIS/ECHO, refreshed quarterly.
Active systems
296
Population served
59.8K
Community systems
69
Groundwater share
97.6%
How does Tolland County compare with other Connecticut counties?
Tolland County has the 4th-most active public water systems among the 22 counties listed for active Connecticut systems in EPA records; among the 9 with 3 or more systems, the median has 277. Its systems report 59,796 people served in total, the 8th-largest county figure in the state and 2% of the statewide total. The average system here reports serving 202 people, well below the Connecticut average of 1,247. Population figures are what each system reports; people served by more than one system, such as a wholesaler and the town that buys from it, are counted by each.
Where does Tolland County's drinking water come from?
By primary water source, Tolland County's active systems draw on groundwater (287, 97%), purchased surface water (7, 2.4%) and purchased groundwater (2, 0.7%). Overall, 98% rely mainly on groundwater (including purchased groundwater) and 2.4% on surface water, compared with 96% and 3.8% across Connecticut. Groundwater means the system draws its water from wells or springs fed by underground aquifers. The county's largest system, University of Connecticut - Main Campus, draws primarily on purchased surface water.
What kinds of water systems operate in Tolland County?
Tolland County's active systems break down as 69 community systems (23%), 58 non-transient non-community systems (20%) and 169 transient non-community systems (57%). A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. EPA lists their owner types as private (85%), local government (13%), state government (1.7%) and federal government (0.3%).
The 50 largest water systems in Tolland County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | University of Connecticut - Main Campus | Tolland | 27,199 | Community | Purchased surface water |
| 2 | Ctwc - Hebron Center Division | Tolland | 1,927 | Community | Groundwater |
| 3 | Coventry High & Nathan Hale Schools | Tolland | 1,252 | Non-transient non-community | Groundwater |
| 4 | Tolland Water Department | Tolland | 1,251 | Community | Groundwater |
| 5 | Ctwc - Amston Lake Division | Tolland | 910 | Community | Groundwater |
| 6 | Horace Porter School | Tolland | 797 | Non-transient non-community | Groundwater |
| 7 | Bolton Center School (K-8) | Tolland | 756 | Non-transient non-community | Groundwater |
| 8 | Ctwc - Uconn South Eagleville Div. | Tolland | 750 | Community | Purchased surface water |
| 9 | Mansfield Middle School | Tolland | 715 | Non-transient non-community | Groundwater |
| 10 | Ctwc - Coventry Hills Div | Tolland | 700 | Community | Groundwater |
| 11 | Mansfield Elementary School | Tolland | 688 | Non-transient non-community | Groundwater |
| 12 | George Hersey Robertson School | Tolland | 573 | Non-transient non-community | Groundwater |
| 13 | Coventry Grammar School | Tolland | 558 | Non-transient non-community | Groundwater |
| 14 | Ctwc - South Coventry System | Tolland | 501 | Community | Groundwater |
| 15 | Woodhaven Apartments | Tolland | 489 | Community | Groundwater |
| 16 | Ctwc - Northern Region-Lakeview Terrace | Tolland | 472 | Community | Groundwater |
| 17 | Hebron Elementary School | Tolland | 450 | Non-transient non-community | Groundwater |
| 18 | Vernon Village Inc.. | Tolland | 430 | Community | Groundwater |
| 19 | Stafford Hollow Water Association | Tolland | 429 | Community | Groundwater |
| 20 | Gilead Hill School | Tolland | 391 | Non-transient non-community | Groundwater |
| 21 | Andover Elementary School | Tolland | 381 | Non-transient non-community | Groundwater |
| 22 | Hazardville - Rye Hill System | Tolland | 352 | Community | Purchased surface water |
| 23 | Willington Senior Center & Housing | Tolland | 327 | Community | Groundwater |
| 24 | Knollwood Apartments | Tolland | 312 | Community | Groundwater |
| 25 | Ctwc - General Water Division | Tolland | 306 | Community | Groundwater |
| 26 | Bolton High School | Tolland | 304 | Non-transient non-community | Groundwater |
| 27 | Justice Education Center Camp Inspire | Tolland | 300 | Transient non-community | Groundwater |
| 28 | Ctwc - Northern Region-Lakewood | Tolland | 276 | Community | Groundwater |
| 29 | Walden Apartments | Tolland | 276 | Community | Groundwater |
| 30 | Crystal Lake School | Tolland | 275 | Non-transient non-community | Groundwater |
| 31 | Johnson Memorial Hospital, Inc. | Tolland | 250 | Community | Groundwater |
| 32 | Ctwc - Uconn Hunting Lodge Div. | Tolland | 234 | Community | Purchased surface water |
| 33 | Ctwc - Pilgrim Hills Division | Tolland | 229 | Community | Groundwater |
| 34 | Ctwc - London Park Division | Tolland | 221 | Community | Groundwater |
| 35 | Mansfield Library Buchanan Center | Tolland | 217 | Transient non-community | Groundwater |
| 36 | Woodland Summit Community Water Assn | Tolland | 216 | Community | Groundwater |
| 37 | Ivy Woods | Tolland | 207 | Community | Groundwater |
| 38 | Tolland Water Dept - Torry Road | Tolland | 204 | Community | Purchased surface water |
| 39 | 1657 Boston Turnpike - Coventry | Tolland | 203 | Transient non-community | Groundwater |
| 40 | Fed Ex Ground | Tolland | 200 | Non-transient non-community | Groundwater |
| 41 | Carriage House Apartments | Tolland | 196 | Community | Groundwater |
| 42 | Cornerstone of Columbia | Tolland | 193 | Transient non-community | Groundwater |
| 43 | Ctwc - Northern Reg-Llynwood System | Tolland | 192 | Community | Groundwater |
| 44 | White Oak Condominiums | Tolland | 192 | Community | Groundwater |
| 45 | Renwood Apartments | Tolland | 190 | Community | Groundwater |
| 46 | Discovery Zone Learning Cntr Columbia | Tolland | 189 | Non-transient non-community | Groundwater |
| 47 | Ctwc - Riversedge Division | Tolland | 179 | Community | Purchased groundwater |
| 48 | Orchard Acres Association | Tolland | 176 | Community | Groundwater |
| 49 | Baxter Farms Community Water Assoc | Tolland | 175 | Community | Groundwater |
| 50 | Ctwc - Crystal Springs Div. | Tolland | 169 | Community | Groundwater |
All other water systems in Tolland County (246)
The remaining active systems filed under Tolland County, largest first, with the population each reports serving.
- Ctwc - Northern Reg-Nathan Hale System160
- Grower Direct Farms Inc.160
- Twin Hills Water District156
- Columbia Manufacturing - Well #2155
- Maplewood-Millbrook Apartments153
- Ctwc - Uconn Depot Div.153
- Columbia Manufacturing - Well #1150
- Ttm Printed Circuit - 228 Upper Road150
- Ellington Fuel Depot, Inc.140
- Ctwc - Uconn Willowbrook Div.134
- Camp Holiday Hill132
- Aquarion-Valley View131
- Ta Travel Plaza130
- LoveâS Travel Stop & Country Store130
- Ctwc - Christ Lutheran Church128
- Deer Park Apartments125
- Ttm Printed Circuit - 15 Industrial Dr120
- Kids Kingdom Daycare Center118
- Club House Apartments115
- Hunting Lodge Apartments115
- Wellswood Estates Foundation, Inc..112
- Willington Ridge Condos - System #2102
- Willington Ridge Condos - System #1102
- Camp Asto Wamah - Hungerford100
- Worthington Pond Farm100
- Abby Water LLC100
- Bestway Food & Fuel Bolton100
- Mansfield Professional Park100
- Camp Asto Wamah - Lodge100
- Camp Asto Wamah - Infirmary100
- Spring Hill Inn97
- Ridgeview Heights96
- Woods Edge Apartments96
- Hillside Condominiums96
- Columbia Ford95
- Mount Hope Montessori School88
- The Kirby Mill & Winery82
- Northfield Commons Association80
- Union Elementary School80
- Coventry Kids Center80
- Coventry Housing Authority-Upper System80
- Plaza Shopping Center80
- Coventry Housing Authority-Lower System80
- Oak Grove Montessori School77
- Network, Inc..77
- Ctwc - Birchwood Heights76
- Stafford Springs Kingdom Hall75
- Stix N Stones Marketplace72
- State Police Barracks Troop C70
- Ctwc - Pinewoods Lane Div68
- North Willington Village Condo Assoc.66
- Miss Merry Mac'S Daycare64
- Ctwc - Northern Reg-Reservoir Heights62
- Eastconn Columbia60
- Ctwc - Wellswood Village Div60
- Eastview Kozley Water Association60
- Luann'S Bakery and Cafe60
- 890 Boston Turnpike60
- Natural Park Apartments60
- Red Balloon Daycare55
- Community Childrens Center Inc..52
- Ttm Printed Circuit - Building 551
- Sun Valley Campground-System #1:Well19450
- Johansen Properties50
- Willington Public Library50
- Phelps Crossing Commercial50
- The Quarry Campground LLC (Campers)50
- Southridge Park Apartments50
- 326 Route 87 - Columbia50
- Cook Drive Association49
- Saint Columba Church49
- Baptist Fellowship Church48
- Whispering Hills, LLC - Well D System48
- Sunset Apartments LLC46
- Scott Electrokrafts45
- Perkins Corner45
- Mirjaf, Inc..42
- The Carlyle Johnson Machine Company42
- Rockville Fish and Game - Clubhouse42
- Roaring Brook Campgnd Coop/Pool/Rest/Rec42
- Fish Family Farm41
- Mansfield Village, LLC40
- Able Coil and Electronics40
- Meadowbrook Shopping Center40
- Bolles Motors Inc.40
- Hebron Arms Apartments39
- Coventry Plaza38
- Rockville Fish and Game - Trap and Skeet37
- Town of Hebron East Street Park37
- Saint Maurice Church Well# 2 - Cr37
- U.S. Department of Agriculture - Tolland36
- United Methodist Church35
- Roaring Brook Campground35
- Gay City State Park/Picnic Area Well33
- Cumberland Farms33
- Jenkins Dental33
- 404 Merrow Road - Tolland33
- 94 Route 66 - Columbia - Restaurant33
- Stafford Professional Suites33
- Ctwc - Columbia Heights Div.32
- Annie E. Vinton School31
- Saint Marys Church31
- Bolton Shell30
- Cider Mill Christian Fellowship30
- Cvs Plaza - Coventry30
- Coventry Food Mart30
- Munson'S Candy Kitchen30
- Hans Christian Andersen Montessori30
- Simoniz USA30
- Herrick Park29
- Mountain Dairy Creamery28
- The Quarry Campground LLC (Store)27
- Stillwater Grill27
- Woodland Terrace27
- Cross Farms Complex27
- Ttm Technologies, Inc. - Building 626
- Dimitris Pizza26
- Ttm Printed Circuit - Building 426
- Tolland Professional Center26
- Ttm Printed Circuit - Building 3a Annex26
- Hop River Homes26
- Sun Valley Campground-System #4:Well 21425
- Bolton Notch Plaza25
- Hebron Church of Hope25
- Newhoca Lodge25
- Columbia Congregational Church25
- Walgreen'S Pharmacy-Coventry25
- 7-Eleven #3252325
- Presbyterian Church of Coventry25
- Villa Louisa/Rossittos25
- Willington Mobil25
- Dragonfire Meadery25
- Cassidy Hill Vineyard25
- Sun Valley Beach Club25
- Willington Dunkin Donuts25
- Lions Park25
- Bicentennial Park25
- Tolland Citgo25
- Wilderness Lake Campground & Resort25
- Dollar General Willington25
- First Congregational Church25
- 500 East Plaza25
- Union Weigh Station25
- Nathan Hale Homestead25
- Prince of Peace Lutheran Church25
- Bolton Town Hall25
- Cove Plaza25
- Thompsons General Store25
- Italian Social Club of Rockville25
- Xtra Mart Water Supply25
- Bolton Alltown Fresh25
- Willington Xtra Mart25
- Heartstone Farm & Winery, LLC25
- Saint Maurice Church Well#1 - Pc25
- Town Office Buildings25
- 2103 Storrs Road25
- 299 Boston Turnpike - Plaza25
- Crystal Lake Plaza25
- Lico Properties, LLC (Dad'S Doughs)25
- Ica Donuts, LLC25
- Dartmouth Village Elderly Housing25
- Church of the Holy Family25
- Hop River Motel25
- Girl Scouts of Ct, Inc.. (Dining Room)25
- Girl Scouts of Ct, Inc.. (Stone House)25
- Dollar General - Bolton25
- Cedar Knob Golf Course25
- Blackledge Country Club25
- Blackledge East LLC25
- 15 River Road Plaza25
- Storrs Community Church25
- Skungamaug River Golf Course25
- The Worship Center25
- Three Js Cafe25
- Girl Scouts of Ct, Inc.. (Camp Well)25
- Camp Hemlocks - Easter Seals (Core Well)25
- Travelers Restaurant25
- Mottas Pastry & Bake Shop25
- Bolton Cosmetic & Family Dentistry25
- Columbia Town Hall25
- Columbia Beach House25
- Paradise Farms Plaza25
- Mansfield Drive-in25
- 167 Tolland Stage Road - Tolland25
- Seventh Day Adventist Church25
- St. Peters Episcopal Church25
- Bolton Professional Bldg25
- Dunkin Donuts25
- A-One Food Store25
- Willington Rest Area (I-84 E&W)25
- 98 Route 66 - Columbia - Ice Cream25
- Pleasant View Golf Ctr.25
- 291 Church Street (Georgia'S)25
- Lucky Strike Lanes, Inc..25
- Sj Ranch, Inc.. (Well #1 - Kitchen)25
- Sj Ranch, Inc.. (Well #2 - Overlook)25
- Sj Ranch, Inc.. (Well #3 - Ranch House)25
- Comcast Corporation25
- Coventry Pizza Restaurant25
- Mansfield Marketplace25
- Village at Crystal Springs25
- Twin Lakes Cafe25
- Gilead Congregational Church25
- Andover Town Hall & Fire Department25
- Rolling Meadows Country Club25
- 466 Storrs Rd25
- Crandalls Park25
- Pour House25
- Andover Plaza25
- Brookside Professional Centre25
- Georginas Pizza25
- 52 Route 6625
- Beckish Senior Center25
- Tallwood Country Club25
- Moose Meadow Campground25
- 39 Adamec Road25
- Coyote Flaco25
- Crandalls Lodge25
- Lenard Hall25
- Schofield Spring25
- Crystal Lake Community Methodist Church25
- Bolton Ice Palace25
- Dollar General, Coventry, Ct25
- Coventry Senior Center25
- Miller Richardson Park25
- Patriots Park - Community Center25
- Willington Pizza House25
- 1st Baptist Church25
- First Church of Christ in Mansfield25
- Mineral Springs Campground-System #125
- Dollar General Andover25
- Bolton Congregational Church25
- Mineral Springs Campground-System #225
- Twin Hills Country Club25
- Backroads Smokin' Bbq25
- 12 Tolland Turnpike (Route 74)25
- 603 Middle Turnpike - Mansfield25
- Parkside Pizza & Ice Cream25
- Wile Hyundai25
- Ellington Ridge Country Club25
- Recreation Park25
- Recreation Park- Bathroom Pavilion25
- Camp Newhoca Park25
- Fit Nutrition25
- Sun Valley Campground-System #2:Well 5625
- Sun Valley Campground-System #3:Well 4025
Tolland County water systems: frequently asked questions
How many public water systems are in Tolland County, Connecticut?
EPA's SDWIS records file 296 active public water systems under Tolland County, Connecticut: 69 community systems (23%), 58 non-transient non-community systems (20%) and 169 transient non-community systems (57%).
Who supplies drinking water in Tolland County, CT?
The largest community water systems filed under Tolland County are University of Connecticut - Main Campus (27,199 people served), Ctwc - Hebron Center Division (1,927 people served) and Tolland Water Department (1,251 people served). Which system serves a particular address depends on its service area, which EPA's SDWIS records do not include; a water bill or the local utility can confirm it.
Does Tolland County's drinking water come from groundwater or surface water?
Of the 296 active public water systems in Tolland County, 98% draw mainly on groundwater and 2.4% on surface water, counting purchased supplies. The largest system, University of Connecticut - Main Campus, uses purchased surface water.
Where can I find a water quality report for Tolland County?
Each community water system must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1, covering the previous calendar year. 69 community systems are filed under Tolland County, so the report to look for is the one from the system that supplies your address.
How can I check violations for a water system in Tolland County?
Open the system's profile from the list on this page. Each profile shows the most recent Safe Drinking Water Act violations in EPA's records, with plain-English labels and whether each one is resolved. For current compliance status, EPA ECHO is the primary source.
More Connecticut water systems
- All Connecticut public water systems· 2,363 active
- New London County· 394 systems
- Litchfield County· 346 systems
- Fairfield County· 337 systems
- Middlesex County· 277 systems
- Windham County· 254 systems
- Hartford County· 219 systems
- How to find out who supplies your drinking water
- How to find and read your annual water quality report
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Public water systems in Tolland County, Connecticut”, https://aquacensus.com/water-systems/connecticut/tolland (data as of October 1, 2026).