Tap Water Quality Report
Tap water quality in PROSPECT, Connecticut
Tap water in PROSPECT, Connecticut receives a grade of D (64/100) from TapWaterSafety.org. It's served by 2 public water systems, primarily WATERBURY WATER DEPARTMENT. The most significant water quality concerns are: PFAS contamination; Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in PROSPECT's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utilities serving PROSPECT.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 43.5 ppb, 725x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 43.4 ppb, 434x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 45.4 ppb, 303x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for WATERBURY WATER DEPARTMENT (system ID CT1510011) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Consumer Confidence Rule | Other (e.g. public notice) | 07/01/2024 | Resolved |
| Lead and Copper Rule | Missed testing or reporting | 12/30/2025 | Resolved |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Water systems serving PROSPECT
PROSPECT is served by 2 public water systems. Click any utility to see its complete grade card and treatment plant contact info.
WATERBURY WATER DEPARTMENT
- PFAS contamination
- Haloacetic acids (HAA9) significantly above health guideline
- Haloacetic acids (HAA5) significantly above health guideline
REGIONAL WATER AUTHORITY
- PFAS contamination
- Haloacetic acids (HAA9) significantly above health guideline
- Haloacetic acids (HAA5) significantly above health guideline
Recommended filters for PROSPECT
Filters matched to the specific contaminants in PROSPECT's water supply.
Filter certified for PFOA/PFOS (NSF/ANSI 53 or 58)
$180-$750Reverse osmosis and some carbon block filters reduce PFAS. Look for certification to NSF/ANSI 53 or 58 for PFOA/PFOS.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in PROSPECT's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
43.5 ppb | 0.06 | — | — | — | — | — | 725× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
43.4 ppb | 0.1 | 60.0 | 60 | — | — | — | 434× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
45.4 ppb | 0.15 | 80.0 | 100 | — | — | — | 303× over |
| Trichloroacetic acid Disinfection byproduct |
17.1 ppb | 0.1 | — | — | — | — | — | 171× over |
| Chloroform Disinfection byproduct |
37.1 ppb | 0.4 | — | — | — | — | — | 93× over |
| Bromodichloromethane Disinfection byproduct |
5.17 ppb | 0.06 | — | — | — | — | — | 86× over |
| 1,2,3-Trichloropropane Other |
0.0556 ppb | 0.0007 | — | — | — | — | — | 79× over |
| Dichloroacetic acid Disinfection byproduct |
11.0 ppb | 0.2 | — | — | — | — | — | 55× over |
| Chromium (hexavalent) Heavy metal |
0.237 ppb | 0.02 | — | — | — | — | — | 12× over |
| Dibromochloromethane Disinfection byproduct |
0.851 ppb | 0.1 | — | — | — | — | — | 8.5× over |
| Perfluorooctanoic acid (PFOA) PFAS |
0.763 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 8.5× over |
| Nitrate and nitrite Inorganic |
0.94 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 6.7× over |
| Nitrate Inorganic |
0.913 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 6.5× over |
| Cadmium Heavy metal |
0.222 ppb | 0.04 | 5.0 | 5 | 3 | 0.04 | — | 5.6× over |
| Radium, combined (-226 and -228) Radiological |
0.28 pCi/L | 0.05 | 5.0 | — | — | — | — | 5.5× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
1.32 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 4.4× over |
| Dibromoacetic acid Disinfection byproduct |
0.0719 ppb | 0.03 | — | — | — | — | — | 2.4× over |
| Manganese Heavy metal |
93.7 ppb | 100.0 | — | 50 | 80 | — | — | Fails EU |
| Uranium Radiological |
0.4 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | Below guideline |
| Chlorate Disinfection byproduct |
177.5 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
82.7 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
2.71 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Di(2-ethylhexyl) phthalate Semi-volatile organic compound |
0.146 ppb | 3.0 | 6.0 | — | — | — | — | Below guideline |
| Vanadium Other |
0.657 ppb | 21.0 | — | — | — | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0104 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Chloromethane Other |
0.0556 ppb | 2.69 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.468 ppb | 25.0 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.0556 ppb | 3.0 | — | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.00402 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.337 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.133 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
0.103 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0638 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Bromide Other |
26.3 ppb | — | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.123 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.527 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Bromomethane Other |
0.0556 ppb | — | — | — | — | — | — | Below guideline |
| n-Propylbenzene Volatile organic compound |
0.1 ppb | — | — | 1 | 10 | 0.15 | — | Below guideline |
| Nitrite Inorganic |
0.00122 ppm | — | 1.0 | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from WATERBURY WATER DEPARTMENT.
General Contact
Treatment Plant
ZIP codes served
PROSPECT's public water systems serve the following ZIP codes: