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Preston, CT Tap Water Quality 2026

Water quality report for Preston, CT — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Preston's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Norwich Public Utilities PWSID: CT1040011 Updated: 2026 Q2
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PFAS above the federal limit at 1 of 3 sampling points

Lead was not detected and no violations are open. However, PFAS exceeds the federal limit at 1 of 3 sampling points, running as high as 3.79 times the limit.

D

Preston earns a D for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: not detected
PFAS above the federal limit at 1 of 3 sampling points
16 violations since 2015, 11 health-based
No violations currently open
Preston's lead level vs. all Connecticut community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Connecticut utilities
Population Served
668
~12846 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
16 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Consumer Confidence Rule OTHER — — 2020 Resolved
TTHM MCL EXCEEDANCE 0.084 MG/L 0.080 mg/L 2018 Resolved
TTHM MCL EXCEEDANCE 0.086 MG/L 0.080 mg/L 2018 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.062 MG/L 0.060 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.089 MG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.082 MG/L 0.080 mg/L 2017 Resolved
Consumer Confidence Rule OTHER — — 2017 Resolved
TTHM MCL EXCEEDANCE 0.086 MG/L 0.080 mg/L 2017 Resolved
Consumer Confidence Rule OTHER — — 2017 Resolved
TTHM MCL EXCEEDANCE 0.084 MG/L 0.080 mg/L 2016 Resolved
Consumer Confidence Rule OTHER — — 2016 Resolved
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2016 Resolved
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2016 Resolved
Public Notice OTHER — — 2015 Resolved
TTHM MCL EXCEEDANCE 0.081 MG/L 0.080 mg/L 2015 Resolved
TTHM MCL EXCEEDANCE 0.093 MG/L 0.080 mg/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

16 violations are on record since 2015, of which 11 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Norwich Public Utilities
PWSID CT1040011
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 668
Service connections 12,846
Systems serving this area 4
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Preston tap water safe to drink? ▼
It meets most federal standards, but PFAS exceeds the federal limit at 1 of 3 sampling points. No violations are currently open.
Does Preston water have PFAS? ▼
Yes. PFAS exceeds the federal limit at 1 of 3 sampling points, running as high as 3.79 times the limit. Limits are enforced on a running annual average at each sampling point, not on a single sample.
Who supplies water to Preston? ▼
Norwich Public Utilities (PWSID CT1040011), one of 4 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2025-09-26. No significant deficiencies were recorded.

What Should Preston Residents Do?

1
Consider a reverse-osmosis filter
Reverse osmosis removes more than 95% of PFAS. Standard carbon pitchers do not.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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