What was found in Griswold's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 2100 µg/L 21% of the EPA limit 10000 µg/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019
Highest in the city: 4000 µg/L — JEWETT CITY WATER CO., S & W SYSTEM · 320 people · 2019 | 6/6 | SYR4 |
| Nitrate-Nitrite | 2065 µg/L 21% of the EPA limit 10000 µg/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019
Highest in the city: 3790 µg/L — JEWETT CITY WATER CO., S & W SYSTEM · 320 people · 2019 | 6/6 | SYR4 |
| Copper | 341.395 µg/L 26% of the EPA limit 1300 µg/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019
Highest in the city: 1050 µg/L — GRISWOLD MHP LLC · 99 people · 2019 | 6/6 | SYR4 |
| Fluoride | 139 µg/L 3.5% of the EPA limit 4000 µg/L Highest in the city: CTWC - COUNTRY MOBILE DIV. · 186 people · 2018 | 2/6 | SYR4 |
| Barium | 18.45 µg/L 0.9% of the EPA limit 2000 µg/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019
Highest in the city: 78.9 µg/L — ASHLAND POND MOBILE HOME PARK · 74 people · 2019 | 6/6 | SYR4 |
| TTHM | 75.4 µg/L 94% of the EPA limit 80 µg/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 4/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 75.24 µg/L 125% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 3/6 | SYR4 |
| Chloroform | 70.12 µg/L No EPA limit set Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 4/6 | SYR4 |
| Lead | 7.51 µg/L 50% of the EPA limit 15 µg/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019
Highest in the city: 42.64 µg/L — CTWC - BAY MOUNTAIN · 440 people · 2017 | 6/6 | SYR4 |
| Trichloroacetic Acid | 40.35 µg/L No EPA limit set Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 3/6 | SYR4 |
| Dichloroacetic Acid | 32.9736 µg/L No EPA limit set Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 3/6 | SYR4 |
| Dibromochloromethane | 1.8 µg/L No EPA limit set Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019
Highest in the city: 9.32 µg/L — CTWC - COUNTRY MOBILE DIV. · 186 people · 2019 | 4/6 | SYR4 |
| Bromoform | 0.5950 µg/L No EPA limit set Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019
Highest in the city: 6.66 µg/L — CTWC - COUNTRY MOBILE DIV. · 186 people · 2019 | 3/6 | SYR4 |
| Bromodichloromethane | 6.45 µg/L No EPA limit set Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 4/6 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.4691 pCi/L 3.1% of the EPA limit 15 pCi/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2018
Highest in the city: 4.9 pCi/L — CTWC - COUNTRY MOBILE DIV. · 186 people · 2018 | 5/6 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 4.42 µg/L 74% of the EPA limit 6 µg/L Highest in the city: ASHLAND POND MOBILE HOME PARK · 74 people · 2019 | 1/6 | SYR4 |
| Combined Uranium | 4.34 µg/L 14% of the EPA limit 30 µg/L Highest in the city: GRISWOLD MHP LLC · 99 people · 2019 | 2/6 | SYR4 |
| Monochloroacetic Acid | 3.33 µg/L No EPA limit set Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 1/6 | SYR4 |
| Dibromoacetic Acid | 0.7460 µg/L No EPA limit set Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019
Highest in the city: 3.2 µg/L — CTWC - COUNTRY MOBILE DIV. · 186 people · 2019 | 3/6 | SYR4 |
| Selenium | 2 µg/L 4% of the EPA limit 50 µg/L Highest in the city: ASHLAND POND MOBILE HOME PARK · 74 people · 2019 | 1/6 | SYR4 |
| Combined Radium (-226 And -228) | 0.5224 pCi/L 10% of the EPA limit 5 pCi/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2018
Highest in the city: 1.8955 pCi/L — ASHLAND POND MOBILE HOME PARK · 74 people · 2019 | 5/6 | SYR4 |
| Monobromoacetic Acid | 1.55 µg/L No EPA limit set Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 1/6 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 1/6 | SYR4 |
| 2,4-D | 0.1650 µg/L 0.2% of the EPA limit 70 µg/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2019 | 1/6 | SYR4 |
| Pfba | 0.0121 µg/L No EPA limit set Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2023 | 1/6 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: JEWETT CITY WATER COMPANY · 6,840 people · 2025
Highest in the city: 0.0025 mg/L — CTWC - COUNTRY MOBILE DIV. · 186 people · 2025 | 6/6 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Griswold
| Supplier | Population served |
|---|---|
| JEWETT CITY WATER COMPANY | 6,840 |
| CTWC - BAY MOUNTAIN | 440 |
| JEWETT CITY WATER CO., S & W SYSTEM | 320 |
| CTWC - COUNTRY MOBILE DIV. | 186 |
| GRISWOLD MHP LLC | 99 |
| ASHLAND POND MOBILE HOME PARK | 74 |
Frequently asked questions about Griswold tap water
Is Griswold tap water safe to drink?
EPA testing detected 26 contaminants in the water serving Griswold. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Griswold?
6 public water suppliers report drinking-water monitoring for Griswold, Connecticut to the EPA. Each is listed above with its population served.
What contaminants are in Griswold's water?
The contaminants EPA monitoring detected in Griswold include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Barium. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.