Water Service Outages in Connecticut by City
88% of Connecticut's 474 community water systems serve 3,300 people or fewer, so many outages and boil water notices affect a single small town or subdivision.
Connecticut drinking water record
Busiest year: 2024 (162 violations). Counted by the year the violation period began. Source: EPA SDWIS.
- Community water systems: 474 active systems serve about 2,726,655 people. 417 of them (88%) serve 3,300 people or fewer; 396 draw mainly on groundwater and 77 on surface water.
- Health-based violations since 2015: 424, at 198 systems (42% of all systems). That share is 41st of 50 states (1 = lowest).
- Most common problems: contaminant averages over the limit (70); coliform treatment technique (47); coliform treatment technique (43). Source: EPA SDWIS
- Largest system: Regional Water Authority, about 418,900 people, with 0 health-based violations since 2015. Source: EPA SDWIS
- Housing age: the median Connecticut home was built in 1967 (US 1980). Older housing stock means more lead service lines left to replace. Source: US Census Bureau, ACS 2020–2024 (table B25035)
| System | People served | Main source | Health violations since 2015 |
|---|---|---|---|
| Regional Water Authority | 418,900 | Surface water | 0 |
| Metropolitan District Commission | 390,887 | Surface water | 0 |
| Aquarion-Eastern Fairfield County | 351,756 | Surface water | 0 |
| Aquarion-Stamford | 119,214 | Surface water | 0 |
| Waterbury Water Department | 107,271 | Surface water | 0 |
| Ctwc - Northern Reg-Western System | 101,313 | Surface water | 0 |
Source: EPA SDWIS.
Connecticut is 4th of 4 (1 = lowest share). Source: EPA SDWIS.
Checked September 2026.
Who to call in Connecticut, city by city
5 Connecticut cities on this site and the water utility for each. What to do while you wait is in our water service outage guide.
- Bridgeport Aquarion Water Company
- Stamford Aquarion Water Company
- New Haven South Central Connecticut Regional Water Authority
- Hartford The Metropolitan District (MDC)
- Waterbury Waterbury Water Department
Frequently asked questions
Is there a water service outage in Connecticut right now?
Not on this site: no reports from Connecticut in the last 24 hours.
How many public water systems are in Connecticut?
EPA records list 474 active community water systems in Connecticut, serving about 2,726,655 people. 88% serve 3,300 people or fewer.
How common are drinking water violations in Connecticut?
Since 2015, 198 of 474 community water systems in Connecticut (42%) have had at least one health-based violation, 424 in total.
What is the largest water system in Connecticut?
Regional Water Authority, which EPA records list as serving about 418,900 people.
Report counts are user-submitted; other figures name their official source. How our data works
Cities in Connecticut with Water Service Outages Information
Bridgeport
no reports in the last 24 hours · pop. 144,399
Aquarion Water Company
Hartford
no reports in the last 24 hours · pop. 122,105
The Metropolitan District (MDC)
New Haven
no reports in the last 24 hours · pop. 134,023
South Central Connecticut Regional Water Authority
Stamford
no reports in the last 24 hours · pop. 135,470
Aquarion Water Company
Waterbury
no reports in the last 24 hours · pop. 107,568
Waterbury Water Department