Statewide Compliance and Testing

• Overall Compliance: Connecticut maintains strong compliance rates, with most of the state’s 2,500+ public water systems meeting federal and state health standards. However, 39 or more systems have tested positive for PFAS contamination according to EPA data, and the compliance clock for the new 4 ppt MCL is running, with utilities required to meet the standard by 2029.
• PFAS Monitoring: Connecticut has implemented comprehensive PFAS testing across all major water systems. The MDC reported no detection of the six EPA-regulated PFAS compounds in recent testing cycles, while systems in southwestern Connecticut and coastal areas continue to work toward compliance with the 2024 EPA rule. You can check live boil water notices and active advisories across the state on our tracker.
• Infrastructure Investment: Over $61 million in federal funding through the Bipartisan Infrastructure Law has been allocated to Connecticut for water infrastructure improvements, including funding specifically for emerging contaminants and support for disadvantaged communities. Additional state bonding has supplemented these investments in 2025–2026.

Major Water Sources and Challenges

• Metropolitan District Commission: Serves approximately 400,000 residents with 44.1 million gallons daily from the Barkhamsted and Nepaug Reservoirs, with comprehensive testing continuing to show no PFAS contamination in their core supply systems as of the most recent reporting period.
• Connecticut River Watershed: Primary source for multiple communities throughout the state, with ongoing monitoring for PFAS and other contaminants. Drinking water sources have remained largely unaffected by reported surface water contamination incidents, including legacy firefighting foam spills at airports.
• Aging Infrastructure Modernisation: Connecticut Water and other utilities are actively replacing aging water mains, with Connecticut Water replacing close to 18 miles of pipe in 2024 through infrastructure renewal programmes, with similar targets set for 2025–2026. Residents in older homes should consider point-of-use water filtration as a precaution while infrastructure is upgraded.

Emerging Contaminant Response

• PFAS Regulation Implementation: EPA’s new drinking water standards for PFOA and PFOS (4 parts per trillion) were finalised in April 2024, with utilities required to comply by 2029. Connecticut utilities are actively testing, planning capital investments, and seeking federal and state funding to ensure compliance ahead of the deadline.
• Proactive Treatment Planning: Major utilities including Aquarion, Connecticut Water, and MDC are implementing advanced treatment technologies to address PFAS detections in affected communities including Stamford, Norwalk, Bridgeport, New Haven, and Hartford. Granular activated carbon (GAC) and high-pressure membrane systems are among the approaches being deployed or evaluated.
• State Legislative Action: Connecticut enacted Public Act No. 24-59 in 2024, banning PFAS in various consumer products and firefighting equipment, with comprehensive restrictions phasing in through 2028. This is a significant step toward preventing new contamination rather than just responding to existing detections.

Advanced Water Management

• State Water Plan Implementation: Connecticut’s comprehensive State Water Plan, adopted in 2019 and under active review for the next planning cycle, establishes integrated water resource management practices to protect and restore water quality through science-based prioritisation and partnership approaches between state agencies and utilities.
• Comprehensive Testing Programmes: The MDC’s state-licensed laboratory conducts over 140,000 physical, chemical, and bacteriological tests annually, checking for more than 130 potential contaminants across reservoirs, treatment plants, and distribution systems — one of the most rigorous testing programmes in the region. For more on how water quality is monitored nationally, see our water quality overview.
• Watershed Protection: Utilities continue to acquire and protect watershed land, with Connecticut Water having transferred land to conservation organisations to ensure long-term source water protection. This remains one of the state’s most cost-effective long-term water quality strategies.

Looking Forward: 2026–2030

Connecticut’s water quality landscape heading into 2026 is defined by strong regulatory oversight, proactive utility management, and substantial federal investment as the state prepares for the PFAS compliance deadline of 2029. While 39 or more public water systems have detected PFAS — particularly in southwestern Connecticut — the state’s high compliance rates for traditional contaminants, combined with comprehensive monitoring and strategic infrastructure investment, position Connecticut relatively well compared to many other states. However, continued success requires sustained collaboration between state agencies, water utilities, and communities to address aging infrastructure, emerging contaminants, climate resilience, and affordability. Residents in PFAS-affected areas or older homes should review their Consumer Confidence Reports annually and consider a certified home filter as a practical precaution.