Compared to top-scoring cities in CT, New Haven lands in the middle tier - some water systems meet standards cleanly, others carry documented violations, and performance can vary significantly across service areas.

Data: EPA SDWIS, FEMA NFIP, Census ACS Last verified: 2026-07-19

Water Quality in New Haven

We track water quality and home safety data for 26 ZIP codes in New Haven, Connecticut (population ~131,106), covering 1 community water system serving approximately 418,900 people region-wide.

No EPA violations have been recorded across any ZIP codes in New Haven - an excellent indicator of water quality.

Average Home Safety Score: C (67/100)

Water sources: Surface water.

Lead Risk

• Average lead level (90th percentile): 0.0010 mg/L
• 78% of housing built before 1986 (when lead solder was banned)
• 46% of housing built before 1950 (when lead pipes were standard)
• Median year built: 1948
• Most common estimated pipe material: Galvanized Steel or Copper
• Lead exposure risk score: 55/100
• Estimated lead service line probability: 24%
• 4 ZIP codes classified as high or very high lead risk

With 78% of homes built before the 1986 lead solder ban, New Haven residents - especially those in older neighborhoods - should consider testing their tap water for lead. Homes built before 1950 are at the highest risk of having lead service lines.

Housing Age Distribution

57,804 total housing units across 26 ZIP codes:

Flood Risk

FEMA National Flood Insurance Program data for New Haven:

• 235 flood insurance claims on record
• $3,463,168 total paid out
• $14,737 average claim payout
• Dominant FEMA flood zone: A (High risk)
• 9 of 26 ZIP codes in high-risk flood zones (A/V)

Radon Risk

Dominant EPA radon zone: Zone 1 (High Risk)

• Zone 1 (High): 26 ZIP codes
• Zone 2 (Moderate): 0 ZIP codes
• Zone 3 (Low): 0 ZIP codes

The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.

Neighborhoods by Safety Score

Safest Areas

Areas Needing Attention

What New Haven Residents Can Do

Test Your Water

• Order a certified lab test - home test kits cost $20–50 and cover lead, bacteria, and common contaminants
• Request your utility's CCR (Consumer Confidence Report) - your water provider must publish this annually
• Check your ZIP code - each area in New Haven has different water systems and risk levels

Filter Your Water

• NSF-certified pitcher filter removes chlorine taste and some contaminants ($20–40)
• NSF 53-certified filter for lead - recommended for homes built before 1986
• Reverse osmosis system removes 95%+ of contaminants including lead, PFAS, and nitrates ($150–400)

Test for Radon

• New Haven is in a high-risk radon area
• Short-term radon test kits cost $10–25
• If levels exceed 4 pCi/L, EPA recommends professional mitigation

Stay Informed

• Visit your ZIP code report for detailed, address-level data
• Sign up for EPA water quality alerts
• Review the annual water quality report from your local utility

All ZIP Codes in New Haven

• 06501 [B]
• 06502 [C]
• 06503 [B]
• 06504 [C]
• 06505 [B]
• 06506 [B]
• 06507 [B]
• 06508 [C]
• 06509 [C]
• 06510 [B]
• 06511 [C]
• 06513 [C]
• 06515 [C]
• 06519 [C]
• 06520 [C]
• 06521 [C]
• 06530 [C]
• 06531 [B]
• 06532 [C]
• 06533 [C]
• 06534 [C]
• 06535 [C]
• 06536 [C]
• 06537 [C]
• 06538 [C]
• 06540 [B]

Frequently Asked Questions

Is the tap water safe to drink in New Haven, CT?

New Haven has an average Home Safety Score of 67/100 (grade C) across 26 ZIP codes. No EPA violations have been recorded. Safety varies by neighborhood - check your specific ZIP code report for details.

Does New Haven have lead in the water?

The average 90th-percentile lead level across New Haven is 0.0010 mg/L, below the EPA action level of 0.015 mg/L. No ZIP codes currently exceed the EPA lead action level. About 78% of housing was built before 1986, when lead solder was banned.

Is New Haven at risk for flooding?

FEMA data shows 235 flood insurance claims in New Haven ZIP codes, with an average payout of $14,737. 9 of 26 ZIP codes are in high-risk FEMA flood zones (A or V).

Are there lead pipes in New Haven homes?

78% of New Haven housing was built before 1986, when lead solder was common in plumbing. 46% was built before 1950, when lead pipes were standard. The most common estimated pipe material is Galvanized Steel or Copper. The estimated probability of lead service lines is 24%. We recommend testing your water if your home was built before 1986.

Data Sources

• Water quality: EPA Safe Drinking Water Information System (SDWIS)
• Lead/copper: EPA Lead and Copper Rule sampling data
• Housing age: U.S. Census Bureau American Community Survey
• Flood data: FEMA National Flood Insurance Program
• Lead exposure: Composite risk score based on housing age, water lead levels, and service line estimates
• Radon: EPA Map of Radon Zones

Updated daily.

Housing Age Profile

Post-1986 construction is where the lower lead-solder risk lives, because that's when the federal ban on lead solder in plumbing took effect. In New Haven, where the median build year is 1948, the housing stock falls broadly on the newer side of that threshold - a distribution that moderates aggregate plumbing-era risk compared to older housing markets.

1948

Median Year Built

0%

Pre-1986 (Lead Paint Risk)

0%

Pre-1970 (Lead Pipes Risk)

Most homes in New Haven were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.

Source: U.S. Census Bureau ACS B25034.

Protecting Children from Lead in New Haven

0.001

mg/L Avg Lead (Limit: 0.015)

Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.

Lead risk in New Haven appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.

Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.

Climate-Related Water Risk for New Haven

How does New Haven's flood record connect to local water quality? The NFIP documents 235 claims - enough to signal recurring events - and 0% of ZIP codes carry FEMA flood zone status. That combination places flooding in the category of factors that can periodically affect water infrastructure, even if the area isn't among the highest-exposure communities in the NFIP dataset.

235

Total FEMA Flood Claims

~12

Est. Claims/Year

New Haven has a moderate flood history with 235 FEMA claims. Flood events can contaminate drinking water and overwhelm treatment systems.

How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure.

Residents in flood-prone areas should consider flood insurance even outside FEMA zones - over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.

Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.