Windham County, Connecticut — public water systems
At a glance
254 active public water systems are filed under Windham County, Connecticut in EPA's SDWIS records, together reporting 63,868 people served. The largest is Windham Water Works, which reports serving 21,214 people. 53 are community water systems serving people where they live; the other 201 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
254
Population served
63.9K
Community systems
53
Groundwater share
99.2%
How does Windham County compare with other Connecticut counties?
Windham County has the 6th-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 63,868 people served in total, the 7th-largest county figure in the state and 2.2% of the statewide total. The average system here reports serving 251 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 Windham County's drinking water come from?
By primary water source, Windham County's active systems draw on groundwater (252, 99%) and surface water (2, 0.8%). Overall, 99% rely mainly on groundwater (including purchased groundwater) and 0.8% 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, Windham Water Works, draws primarily on surface water.
What kinds of water systems operate in Windham County?
Windham County's active systems break down as 53 community systems (21%), 50 non-transient non-community systems (20%) and 151 transient non-community systems (59%). 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 (87%), local government (12%) and state government (1.6%).
The 50 largest water systems in Windham County
🔒 Create a free account to export CSV| # | Water system | County | Population served | Type | Source |
|---|---|---|---|---|---|
| 1 | Windham Water Works | Windham | 21,214 | Community | Surface water |
| 2 | Putnam Water Pollution Control Authority | Windham | 7,300 | Community | Surface water |
| 3 | Ctwc - Crystal System | Windham | 6,378 | Community | Groundwater |
| 4 | Ctwc - Gallup System | Windham | 2,538 | Community | Groundwater |
| 5 | Ctwc - Plainfield System | Windham | 1,713 | Community | Groundwater |
| 6 | Killingly High School & Agricultural Ctr | Windham | 1,400 | Non-transient non-community | Groundwater |
| 7 | Woodstock Academy | Windham | 1,125 | Non-transient non-community | Groundwater |
| 8 | Ctwc - Thompson System | Windham | 1,070 | Community | Groundwater |
| 9 | Frito-Lay | Windham | 903 | Non-transient non-community | Groundwater |
| 10 | Woodstock Elementary School | Windham | 636 | Non-transient non-community | Groundwater |
| 11 | Woodstock Academy South Campus | Windham | 620 | Community | Groundwater |
| 12 | Woodstock Middle School | Windham | 511 | Non-transient non-community | Groundwater |
| 13 | Pomfret Community School | Windham | 500 | Non-transient non-community | Groundwater |
| 14 | Parish Hill High School | Windham | 487 | Non-transient non-community | Groundwater |
| 15 | North Windham Elementary School | Windham | 485 | Non-transient non-community | Groundwater |
| 16 | Ashford School | Windham | 475 | Non-transient non-community | Groundwater |
| 17 | Pomfret School | Windham | 400 | Community | Groundwater |
| 18 | Canterbury Elementary School | Windham | 350 | Non-transient non-community | Groundwater |
| 19 | Camp Woodstock - Upper Main Camp | Windham | 346 | Transient non-community | Groundwater |
| 20 | Hole in the Wall Gang Camp-Main System#1 | Windham | 335 | Transient non-community | Groundwater |
| 21 | Ctwc - Ashford Park Division | Windham | 334 | Community | Groundwater |
| 22 | Camp Woodstock - New Dining Well | Windham | 322 | Transient non-community | Groundwater |
| 23 | Camp Connri | Windham | 319 | Transient non-community | Groundwater |
| 24 | Wyndham Park Apartments | Windham | 312 | Community | Groundwater |
| 25 | Dr. Helen Baldwin School | Windham | 310 | Non-transient non-community | Groundwater |
| 26 | Sterling Water System | Windham | 308 | Community | Groundwater |
| 27 | The Rectory School | Windham | 300 | Community | Groundwater |
| 28 | Chaplin Elementary School | Windham | 280 | Non-transient non-community | Groundwater |
| 29 | Whitcraft LLC | Windham | 272 | Non-transient non-community | Groundwater |
| 30 | Moosup Garden Apartments | Windham | 270 | Community | Groundwater |
| 31 | Marianapolis Prep School - Admin/School | Windham | 266 | Non-transient non-community | Groundwater |
| 32 | Matulaitis Nursing Home | Windham | 254 | Community | Groundwater |
| 33 | Rogers Corp - Rogers Well | Windham | 250 | Non-transient non-community | Groundwater |
| 34 | Eastford Elementary School | Windham | 225 | Non-transient non-community | Groundwater |
| 35 | Hampton Elementary School | Windham | 220 | Non-transient non-community | Groundwater |
| 36 | Peake Brook LLC | Windham | 208 | Non-transient non-community | Groundwater |
| 37 | Quinebaug Mobile Home Park | Windham | 205 | Community | Groundwater |
| 38 | Scotland Elementary School | Windham | 200 | Non-transient non-community | Groundwater |
| 39 | Woodstock Meadows Condominium Assn. | Windham | 180 | Community | Groundwater |
| 40 | Linemaster Switch Corp | Windham | 178 | Non-transient non-community | Groundwater |
| 41 | Tri-State Baptist Church | Windham | 157 | Transient non-community | Groundwater |
| 42 | Campbell Heights Apartments | Windham | 152 | Community | Groundwater |
| 43 | New England Laborers Academy - Main Sys | Windham | 151 | Non-transient non-community | Groundwater |
| 44 | Evangelical Christian Center -Rec Center | Windham | 150 | Transient non-community | Groundwater |
| 45 | Solair Recreational League - Lower Ridge | Windham | 150 | Non-transient non-community | Groundwater |
| 46 | Inn at Woodstock Hill | Windham | 145 | Transient non-community | Groundwater |
| 47 | Perry Hill Estates Apartments Inc.. | Windham | 144 | Community | Groundwater |
| 48 | Ashford Hills Apartments | Windham | 136 | Community | Groundwater |
| 49 | Douglas Manor | Windham | 135 | Community | Groundwater |
| 50 | Birch Hills Condominiums | Windham | 132 | Community | Groundwater |
All other water systems in Windham County (204)
The remaining active systems filed under Windham County, largest first, with the population each reports serving.
- Loos & Co - Well #1130
- Marianapolis Prep School - St Johns128
- Pinecrest Condominiums110
- Gibson Hill Park100
- Roseland Terrace Association, Inc..100
- Cubic Scoops100
- River Bend Campground100
- Meadowside of Woodstock Inc..100
- Hide Away Cove Campground100
- Christian Fellowship Church of Scotland100
- Brialee Rv & Tent Park100
- Church of the Nazarine100
- Fall Brook Mobile Home Park98
- Woodlawn Apartments96
- Solair Recreational League - Pavilion93
- Rogers Corp - Poron Well90
- Darigan-Barr, Inc..89
- Eastconn - Danielson87
- Thompson Hill Water Co - Paula Lane Div85
- Evangelical Christian Center - Main84
- Wolf Den State Park/Campground Well83
- Numa Tool Co Inc.80
- Bst Systems, Inc..75
- Charlie Brown Campground75
- Charlie Brown Campground-Rec Hall75
- Cranberry Bog Apartments72
- Blondie'S Country Diner70
- Chaplin Woods Condominiums69
- Longview Estates, LLC69
- Killingly Hwy Dept Garage68
- Country Manor66
- Eastconn Central Administration65
- Knollwood Plaza65
- White Barn Children'S Center65
- Westview Terrace Mobile Home Park60
- Conrads Park60
- Canterbury Childrens Academy59
- Ctwc - Cornfield Point Div.57
- Justice Resource Institute, Inc..56
- Windham Phoenix Academy55
- The Learning Den55
- Marianapolis Prep School - St Alberts51
- Sun Ridge Resort Campground50
- Mar-Lea Park Apartments50
- Fiberoptics Technology (Old)50
- Nutmeg Container Corporation50
- Chamberlain Lake Campground50
- Better Val-U Supermarkets, Inc..50
- Highland Campground50
- Village Shopping Plaza49
- Knollbrook Village Elderly Housing48
- Country Acres Park48
- Seely - Brown Village48
- Gorman Road Apartments48
- The Vanilla Bean Cafe47
- Canterbury Plains Mall46
- Moosup Pond Terrace, LLC46
- 474 Putnam Pike46
- 123, 125, & 127 Norwich Road45
- 137 Norwich Rd - Village Commons45
- Tee Rex45
- Brookwood Apartments44
- Riverview Pizza Restaurant43
- Woodstock Trading Post42
- Canterbury Municipal Offices41
- Colonial Plaza Condominium Assn, Inc..40
- Ivanhoe Tool & Die Co Inc.40
- Koinonia School of Sports40
- Camp Woodstock - Boat House Well40
- Camp Woodstock - Roskin Well40
- Canterbury Commons39
- Learning Clinic - Wells B, C, & D39
- Woodstock Town Hall39
- First Congregational Church of Woodstock38
- The Owls Nest Day School38
- 773 Quinebaug Road37
- Weideles Pizza & Pub (Oneco Commons)37
- Brooklyn Pizza Restaurant37
- Sharpe Hill Vineyard - Tasting Room37
- Brookscrossing Apartments36
- 55-69 Nott Highway36
- Hubbard Hill Apartments36
- Putnam Preschool and Childcare, LLC.36
- 10-16 Putnam Road36
- Fawn Ridge Association Inc..36
- Jumbo Apartments35
- Stonehurst at Hampton Valley â Barn35
- Railside Tavern35
- Peppertree Camping34
- Taylor Brooke Brewery33
- Killingly Professional Building33
- Arnio Drive LLC33
- Cumberland Farms Store #463232
- Ctwc - Pompey Hollow Division32
- Northwood Childcare32
- Pintail Restaurant31
- Bach Dor Cafe31
- Windham/Tolland 4-H Camp - Well #231
- Country Farms30
- Nickerson Park Campground30
- Brooklyn Manor30
- Taylor Brooke Winery30
- 20 Norwich Road, LLC30
- Learning Clinic - Overlook Bldg30
- Putnam Chrysler Dodge Jeep30
- 1075 North Main Street - Killingly30
- 60 Hartford Pike29
- Marika'S Place29
- Harrisville Golf Course29
- The Vineyard at Hillyland28
- Moosup Manor27
- Charlie'S Place27
- Woodstock Housing Authority26
- Saint Augustine Church26
- Saint Philip Church Rectory26
- Edi'S Place25
- Eastford Baptist Church25
- Wicked Cow25
- 610 Wauregan Road25
- Zlotnicks Garage LLC25
- Town of Brooklyn, Prince Hill Park25
- Stonewall Commons of Putnam25
- Prudence Crandall Museum25
- Hole in the Wall Gang Camp (#2)25
- Brooklyn Market25
- Ashford Dari Bar25
- Sorels Garage25
- Black Pond Brews25
- Thompson House of Pizza25
- Goodwin Conservation Center25
- We-Li-Kit Ice Cream25
- 283 Scenic Route 16925
- Hank'S Dairy Bar25
- Roseland Park Golf Course25
- Evangelical Covenant Church25
- Scotland Fire Dept25
- Quinnatisset Country Club25
- Always Moore, LLC25
- Windham/Tolland 4-H Camp - Dining Hall25
- Dollar General - Chaplin25
- Route 193 LLC Restaurant25
- Stonehurst at Hampton Valley â Inn25
- June Norcross Webster - Well #225
- White Horse at Vernon Stiles Inn25
- Zips Diner Inc.25
- Valley Springs Sportsman Club25
- Bestway Food & Fuel Chaplin25
- 19 Putnam Rd Store LLC25
- Our Lady of La Salette Church25
- First Congregational Church25
- June Norcross Webster (Cafeteria Well)25
- Stateline Camp Resort-Well #125
- Wrights Mill Farm - Lodge25
- Thompson Rod & Gun Club25
- Little River Plaza25
- Rollies Variety25
- Sterling Municipal Building25
- South Woodstock Baptist Church25
- Lord Thompson Manor25
- Quiet Corner Inn25
- 292 Riverside Drive - Thompson25
- 37 Putnam Road25
- Thompson Speedway Restaurant25
- Thompson Speedway-Concession25
- Thompson Speedway-Garage25
- Ashford Motel25
- Plainfield Rest Area (I-395 N&S)25
- Gauthier Field25
- Brooklyn Country Club/Golf Course25
- St Pauls Episcopal Church25
- Vineyard Valley Golf Club25
- North Windham Fire Department25
- Calvary Chapel25
- Hanks Restaurant25
- First Congregational Church of Windham25
- Apollo Restaurant and Pizza25
- 1019 Norwich Road25
- Chaplin Senior Center25
- Learning Clinic - Brooklyn Bldg25
- GloriaâS Kitchen25
- Dollar General - Eastford25
- Flats Business Park25
- Church of Latter-Day Saints, Ashford25
- Learning Clinic - Applied Arts Bldg25
- Cozy Corner Restaurant25
- Chaplin Town Hall25
- Cha-Wi-Ma Co-Op25
- Skate-Inn, Inc..25
- Woodstock Valley Marketplace25
- Fiberoptics Technology (New)25
- Oneco Market25
- Our Lady of Lourdes Catholic Church25
- Chaplin Congregational Church25
- Westford Congregational Church25
- Crystal Pond Park25
- 518 Norwich Road - Plainfield25
- Camp Woodstock - Bath Shower Well25
- Chaplin Park25
- Chaar Sahibzaade Realty LLC25
- Watercure Farm, LLC25
- Four Gs Pizzeria25
- Main St. Gelato25
- West Thompson Lake Campground25
- Eastford Baptist Church- Activity Center25
Windham County water systems: frequently asked questions
How many public water systems are in Windham County, Connecticut?
EPA's SDWIS records file 254 active public water systems under Windham County, Connecticut: 53 community systems (21%), 50 non-transient non-community systems (20%) and 151 transient non-community systems (59%).
Who supplies drinking water in Windham County, CT?
The largest community water systems filed under Windham County are Windham Water Works (21,214 people served), Putnam Water Pollution Control Authority (7,300 people served) and Ctwc - Crystal System (6,378 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 Windham County's drinking water come from groundwater or surface water?
Of the 254 active public water systems in Windham County, 99% draw mainly on groundwater and 0.8% on surface water, counting purchased supplies. The largest system, Windham Water Works, uses surface water.
Where can I find a water quality report for Windham 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. 53 community systems are filed under Windham 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 Windham 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
- Litchfield County· 346 systems
- Fairfield County· 337 systems
- Tolland County· 296 systems
- Middlesex County· 277 systems
- Hartford County· 219 systems
- New Haven County· 212 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 Windham County, Connecticut”, https://aquacensus.com/water-systems/connecticut/windham (data as of October 1, 2026).