Connecticut
Fairfield County drinking water quality
336 active public water systems serve 778,705 people in Fairfield County. 91 are compliant, 245 had at least one EPA violation in the past three years, 7 are designated serious violators, and 43 carry a health flag.
Active systems
336
61 community systems
People served
779K
by public water systems
Systems with violations
245
73% of active systems, past 3 years
Serious violators
7
43 systems carry a health flag
Needs attention
Stanwich Club
CT0570164 · Greenwich · Non-Transient non-community system · Serves 130
0 rules violated in the past three years
Rockrimmon Country Club
CT1350042 · Stamford · Non-Transient non-community system · Serves 60
4 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR) and Revised Total Coliform Rule (RTCR).
27 Maple Drive
CT0859071 · Monroe · Community water system · Serves 38
3 rules violated in the past three years. Unresolved: Consumer Confidence Rule (CCR) and Public Notification Rule.
Keeler Ridgefield B
CT1180322 · Ridgefield · Non-Transient non-community system · Serves 30
8 rules violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR), Public Notification Rule, and Revised Total Coliform Rule (RTCR).
Merwin Meadows Town Park
CT1610094 · Wilton · Transient non-community system · Serves 25
3 rules violated in the past three years. Unresolved: E. coli (Escherichia coli) and Revised Total Coliform Rule (RTCR).
Rebellion Kitchen and Bar
CT0341244 · Danbury · Transient non-community system · Serves 25
2 rules violated in the past three years. Unresolved: E. coli (Escherichia coli) and Revised Total Coliform Rule (RTCR).
Round Hill Community Church
CT0570142 · Greenwich · Non-Transient non-community system · Serves 25
4 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Fairfield Hills
CT0970021 · Newtown · Community water system · Serves 2,610
3 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Ridgefield High and Middle School
CT1180382 · Ridgefield · Non-Transient non-community system · Serves 2,575
1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
New Fairfield Elementary School
CT0915053 · New Fairfield · Non-Transient non-community system · Serves 1,425
3 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
36 more systems with a serious violator or health flag designation are in the lists below.
Community water systems
61 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Aquarion-Eastern Fairfield County Beacon Falls, Bridgeport, Darien and 17 more |
351,756 | 2 | 0 | |
|
Aquarion-Stamford Darien, Greenwich, Stamford |
119,214 | 0 | 0 | |
|
Danbury Water Department Bethel, Brookfield, Danbury and 1 more |
62,055 | 0 | 0 | |
|
Aquarion-Greenwich Greenwich, Stamford |
53,297 | 1 | 0 | |
|
South Norwalk Electric & Water Darien, New Canaan, Norwalk and 1 more |
42,000 | 1 | 0 | |
|
Norwalk First Taxing District New Canaan, Norwalk, Westport and 1 more |
40,256 | 0 | 0 | |
|
Aquarion-Darien Darien, New Canaan, Norwalk and 1 more |
18,737 | 0 | 0 | |
|
Aquarion-New Milford Regional Brookfield, New Milford |
13,331 | 4 | 0 | |
|
Aquarion-New Canaan New Canaan, Stamford |
10,097 | 0 | 0 | |
|
Bethel Water Dept Bethel, Danbury |
9,507 | 6 | 0 | |
|
Aquarion-Ridgefield Ridgefield |
7,476 | 1 | 0 | |
|
Aquarion-Newtown Regional Newtown |
6,054 | 1 | 1 | |
|
Fairfield Hills Newtown |
2,610 | 3 | 2 | |
|
Candlewood Shores Tax District Brookfield, New Fairfield |
1,315 | 2 | 0 | |
|
Aquarion-Ridgefield Knolls Ridgefield |
958 | 1 | 1 | |
|
Lake Waubeeka Association Danbury |
712 | 0 | 0 | |
|
Aquarion-Ball Pond New Fairfield |
629 | 0 | 0 | |
|
Brunswick School (lower & Lower Middle) Greenwich |
567 | 0 | 0 | |
|
Candlewood Knolls Water Authority New Fairfield |
524 | 1 | 0 | |
|
Stone Bridge Center for Health & Rehab Newtown |
504 | 2 | 1 | |
|
Aquarion-New Fairfield New Fairfield |
406 | 1 | 1 | |
|
Stony Hill Village Condominium Assn Brookfield |
392 | 4 | 0 | |
|
Aqua Vista Assoc, INC Danbury |
388 | 0 | 0 | |
|
Knollcrest Tax District New Fairfield |
356 | 5 | 1 | |
|
Aquarion-Timber Trails New Fairfield, Sherman |
310 | 0 | 0 | |
|
Aquarion-Possum Ridge New Fairfield |
307 | 0 | 0 | |
|
Arrowhead Point Homeowners Assn Inc. Brookfield, New Fairfield |
296 | 0 | 0 | |
|
Aquarion-Oakwood Acres New Fairfield |
286 | 1 | 1 | |
|
Aquarion-Indian Spring Danbury |
242 | 0 | 0 | |
|
Aquarion-Hollandale Estates Danbury |
200 | 0 | 0 | |
|
55 Sugar Street Newtown |
158 | 4 | 1 | |
|
Hawthorne Terrace Assoc Danbury |
156 | 1 | 0 | |
|
Aquarion-Ken Oaks Danbury |
152 | 0 | 0 | |
|
Aquarion-Indian Fields Brookfield |
147 | 1 | 0 | |
|
Brookfield Hills Condominium Unit Owners Brookfield |
144 | 3 | 1 | |
|
Candlewood Orchards Property Owners Corp Brookfield, New Fairfield |
144 | 2 | 0 | |
|
Snug Harbor Development Corp Danbury |
144 | 1 | 0 | |
|
Aquarion-Pearce Manor Danbury |
133 | 0 | 0 | |
|
Aquarion-Hickory Hills Brookfield |
132 | 0 | 0 | |
|
Aquarion-Scodon Ridgefield |
130 | 0 | 0 | |
|
Lake Lillinonah Shores Condos Brookfield |
130 | 2 | 2 | |
|
Aquarion-Butternut Brookfield |
124 | 0 | 0 | |
|
Aquarion-Barnum Ridgefield |
120 | 0 | 0 | |
|
Shady Acres Mobile Home Park Danbury |
117 | 1 | 0 | |
|
Danbury Water Dept-Ridgeview Gardens Danbury |
116 | 0 | 0 | |
|
Aquarion-Rolling Ridge Danbury |
115 | 0 | 0 | |
|
Cornell Hills Assoc, INC Danbury |
108 | 3 | 2 | |
|
Weston Water Supply Weston |
100 | 1 | 1 | |
|
Aquarion-Fieldstone Ridge Danbury, New Fairfield |
84 | 0 | 0 | |
|
Aquarion-Berkshire Bethel |
75 | 0 | 0 |
Non-community systems (275: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (1,523, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Connecticut records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.