Ctwc - Columbia Heights Div., CT
Lead detected, under the action levels
Latest 90th-percentile lead: 1.3 ppb (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Who runs the water here
Ctwc - Columbia Heights Div. serves about 32 people through 31 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Tolland County, Connecticut. EPA system ID: CT0300011; phone on file: 860-944-9655. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2024 (2.1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Ctwc - Columbia Heights Div. is 12.7 ppb across 10 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.3 ppb |
| 2024 | 2.1 ppb |
| 2023 | 0 (not detected) |
| 2022 | 3.1 ppb |
| 2021 | 2 ppb |
| 2020 | 5 ppb |
| 2019 | 0 (not detected) |
| 2018 | 12.7 ppb over 10 |
| 2017 | 0.6 ppb |
| 2016 | 3 ppb |
Where this result ranks
Of the 493 Connecticut systems with a lead result, the median latest reading is 0.8 ppb; 2 are over 15 ppb right now and 49 have gone over at some point. Ctwc - Columbia Heights Div.'s 1.3 ppb sits at the 62nd percentile in Connecticut and the 60th nationally (higher means more lead).
Neighbouring systems
63 other systems share Tolland County; 24 of them have a higher latest lead result than Ctwc - Columbia Heights Div.. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| University Of Connecticut - Main Campus | 27,199 | 7.6 ppb |
| Ctwc - Hebron Center Division | 1,927 | 0 (not detected) |
| Tolland Water Department | 1,251 | 0 (not detected) |
| Ctwc - Amston Lake Division | 910 | 1.3 ppb |
| Ctwc - Uconn South Eagleville Div. | 750 | 0 (not detected) |
| Ctwc - Northern Reg - Lakewood/Lakeview | 748 | 0 (not detected) |
| Ctwc - Coventry Hills Div | 700 | 0 (not detected) |
| Ctwc - South Coventry System | 501 | 3.2 ppb |
| Woodhaven Apartments | 489 | 0.6 ppb |
| Vernon Village Inc. | 430 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Clinton, CT may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Ctwc - Columbia Heights Div. whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. Systems that went over once often dip back under; here is what that means.