Water Quality Report · Updated October 07, 2026
CTWC - NORTHERN REG-WESTERN SYSTEM
CTWC - NORTHERN REG-WESTERN SYSTEM delivers tap water graded F (53/100) by TapWaterSafety.org. The utility serves approximately 101,313 residents in EAST GRANBY, Connecticut using surface water. The most significant water quality concerns are: PFAS contamination; Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Arsenic detected. For questions, the utility can be reached at 860-944-9655.
Is EAST GRANBY tap water safe to drink?
CTWC - NORTHERN REG-WESTERN SYSTEM delivers tap water that earns a grade of F (53/100) from TapWaterSafety.org — a poor rating, with significant contamination concerns and/or recent violations.
The utility serves 101,313 residents in EAST GRANBY and 11 other communities, drawing from surface water.
Public testing data identifies 16 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Bromodichloromethane, Arsenic, Trichloroacetic acid, Chloroform, Dichloroacetic acid, Dibromochloromethane, Nitrate, Nitrate and nitrite, Chromium (hexavalent), Perfluorooctanoic acid (PFOA), Perfluorooctane sulfonate (PFOS), Radium, combined (-226 and -228), Strontium-90. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
EPA compliance record
Official U.S. EPA records for CTWC - NORTHERN REG-WESTERN SYSTEM (system ID CT0473011) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Public Notice Rule and Revised PN Rule | Other (e.g. public notice) | 06/08/2018 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Quick actions for EAST GRANBY residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for CTWC - NORTHERN REG-WESTERN SYSTEM.
PFAS contamination
Severe concernPerfluorooctane sulfonate (PFOS), Perfluorooctanoic acid (PFOA) 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 20.8 ppb, 347x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 44.4 ppb, 296x above the EWG health guideline of 0.15 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 19.0 ppb, 190x above the EWG health guideline of 0.1 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.525 ppb.
Contact CTWC - NORTHERN REG-WESTERN SYSTEM
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for EAST GRANBY
Filters matched to the specific contaminants in this 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.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 53/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 |
20.8 ppb | 0.06 | — | — | — | — | — | 347× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
44.4 ppb | 0.15 | 80.0 | 100 | — | — | — | 296× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
19.0 ppb | 0.1 | 60.0 | 60 | — | — | — | 190× over |
| Bromodichloromethane Disinfection byproduct |
9.05 ppb | 0.06 | — | — | — | — | — | 151× over |
| Arsenic Heavy metal |
0.525 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 131× over |
| Trichloroacetic acid Disinfection byproduct |
11.3 ppb | 0.1 | — | — | — | — | — | 113× over |
| Chloroform Disinfection byproduct |
28.3 ppb | 0.4 | — | — | — | — | — | 71× over |
| Dichloroacetic acid Disinfection byproduct |
7.18 ppb | 0.2 | — | — | — | — | — | 36× over |
| Dibromochloromethane Disinfection byproduct |
2.37 ppb | 0.1 | — | — | — | — | — | 24× over |
| Nitrate Inorganic |
2.16 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 15× over |
| Nitrate and nitrite Inorganic |
2.02 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 14× over |
| Chromium (hexavalent) Heavy metal |
0.256 ppb | 0.02 | — | — | — | — | — | 13× over |
| Perfluorooctanoic acid (PFOA) PFAS |
1.0 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 11× over |
| Perfluorooctane sulfonate (PFOS) PFAS |
0.8 ppt | 0.3 | 4.0 | 100 | 100 | 1 | — | 2.7× over |
| Radium, combined (-226 and -228) Radiological |
0.12 pCi/L | 0.05 | 5.0 | — | — | — | — | 2.5× over |
| Strontium-90 Radiological |
0.75 pCi/L | 0.35 | — | — | — | — | — | 2.1× over |
| Uranium Radiological |
0.39 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | Below guideline |
| Dibromoacetic acid Disinfection byproduct |
0.0188 ppb | 0.03 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
83.1 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Benzo[a]pyrene Other |
0.00177 ppb | 0.007 | 0.2 | — | — | — | — | Below guideline |
| Barium Heavy metal |
144.7 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Vanadium Other |
2.57 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
10.7 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.029 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
1.17 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Selenium Heavy metal |
0.154 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.214 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.177 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
0.154 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.269 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Lithium Other |
2.53 ppb | — | — | — | — | — | — | 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
CTWC - NORTHERN REG-WESTERN SYSTEM service area
This water system serves 12 communities in Hartford County, Connecticut. Click any city for its dedicated tap water quality page.
Find the right filter for EAST GRANBY water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.