Tap Water Quality Report
Tap water quality in MIDDLEBURY, Connecticut
Tap water in MIDDLEBURY, Connecticut receives a grade of F (55/100) from TapWaterSafety.org. It's served by 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 MIDDLEBURY's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving MIDDLEBURY.
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.
Recommended filters for MIDDLEBURY
Filters matched to the specific contaminants in MIDDLEBURY's water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
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 MIDDLEBURY'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 |
| Chloroform Disinfection byproduct |
37.1 ppb | 0.4 | — | — | — | — | — | 93× over |
| 1,2,3-Trichloropropane Other |
0.0556 ppb | 0.0007 | — | — | — | — | — | 79× over |
| Bromodichloromethane Disinfection byproduct |
4.3 ppb | 0.06 | — | — | — | — | — | 72× over |
| Cadmium Heavy metal |
0.222 ppb | 0.04 | 5.0 | 5 | 3 | 0.04 | — | 5.6× over |
| Chromium (hexavalent) Heavy metal |
0.0398 ppb | 0.02 | — | — | — | — | — | 2.0× over |
| Chlorate Disinfection byproduct |
159.0 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.13 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | Below guideline |
| Nitrate and nitrite Inorganic |
0.0233 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Nitrate Inorganic |
0.0224 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | Below guideline |
| Manganese Heavy metal |
6.4 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Chloromethane Other |
0.0556 ppb | 2.69 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.0556 ppb | 3.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
6.67 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Vanadium Other |
0.095 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.133 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0362 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Bromomethane Other |
0.0556 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.21 ppm | — | 4.0 | 1.5 | 1.5 | — | — | 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.