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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

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Active public water systems in Tolland County, Connecticut
#Water systemCountyPopulation servedTypeSource
1University of Connecticut - Main CampusTolland27,199CommunityPurchased surface water
2Ctwc - Hebron Center DivisionTolland1,927CommunityGroundwater
3Coventry High & Nathan Hale SchoolsTolland1,252Non-transient non-communityGroundwater
4Tolland Water DepartmentTolland1,251CommunityGroundwater
5Ctwc - Amston Lake DivisionTolland910CommunityGroundwater
6Horace Porter SchoolTolland797Non-transient non-communityGroundwater
7Bolton Center School (K-8)Tolland756Non-transient non-communityGroundwater
8Ctwc - Uconn South Eagleville Div.Tolland750CommunityPurchased surface water
9Mansfield Middle SchoolTolland715Non-transient non-communityGroundwater
10Ctwc - Coventry Hills DivTolland700CommunityGroundwater
11Mansfield Elementary SchoolTolland688Non-transient non-communityGroundwater
12George Hersey Robertson SchoolTolland573Non-transient non-communityGroundwater
13Coventry Grammar SchoolTolland558Non-transient non-communityGroundwater
14Ctwc - South Coventry SystemTolland501CommunityGroundwater
15Woodhaven ApartmentsTolland489CommunityGroundwater
16Ctwc - Northern Region-Lakeview TerraceTolland472CommunityGroundwater
17Hebron Elementary SchoolTolland450Non-transient non-communityGroundwater
18Vernon Village Inc..Tolland430CommunityGroundwater
19Stafford Hollow Water AssociationTolland429CommunityGroundwater
20Gilead Hill SchoolTolland391Non-transient non-communityGroundwater
21Andover Elementary SchoolTolland381Non-transient non-communityGroundwater
22Hazardville - Rye Hill SystemTolland352CommunityPurchased surface water
23Willington Senior Center & HousingTolland327CommunityGroundwater
24Knollwood ApartmentsTolland312CommunityGroundwater
25Ctwc - General Water DivisionTolland306CommunityGroundwater
26Bolton High SchoolTolland304Non-transient non-communityGroundwater
27Justice Education Center Camp InspireTolland300Transient non-communityGroundwater
28Ctwc - Northern Region-LakewoodTolland276CommunityGroundwater
29Walden ApartmentsTolland276CommunityGroundwater
30Crystal Lake SchoolTolland275Non-transient non-communityGroundwater
31Johnson Memorial Hospital, Inc.Tolland250CommunityGroundwater
32Ctwc - Uconn Hunting Lodge Div.Tolland234CommunityPurchased surface water
33Ctwc - Pilgrim Hills DivisionTolland229CommunityGroundwater
34Ctwc - London Park DivisionTolland221CommunityGroundwater
35Mansfield Library Buchanan CenterTolland217Transient non-communityGroundwater
36Woodland Summit Community Water AssnTolland216CommunityGroundwater
37Ivy WoodsTolland207CommunityGroundwater
38Tolland Water Dept - Torry RoadTolland204CommunityPurchased surface water
391657 Boston Turnpike - CoventryTolland203Transient non-communityGroundwater
40Fed Ex GroundTolland200Non-transient non-communityGroundwater
41Carriage House ApartmentsTolland196CommunityGroundwater
42Cornerstone of ColumbiaTolland193Transient non-communityGroundwater
43Ctwc - Northern Reg-Llynwood SystemTolland192CommunityGroundwater
44White Oak CondominiumsTolland192CommunityGroundwater
45Renwood ApartmentsTolland190CommunityGroundwater
46Discovery Zone Learning Cntr ColumbiaTolland189Non-transient non-communityGroundwater
47Ctwc - Riversedge DivisionTolland179CommunityPurchased groundwater
48Orchard Acres AssociationTolland176CommunityGroundwater
49Baxter Farms Community Water AssocTolland175CommunityGroundwater
50Ctwc - Crystal Springs Div.Tolland169CommunityGroundwater

All other water systems in Tolland County (246)

The remaining active systems filed under Tolland County, largest first, with the population each reports serving.

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

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).