Ctwc - South Coventry System, CT
Lead detected, under the action levels
Latest 90th-percentile lead: 3.2 ppb (monitoring period 2026-2026). 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.
About Ctwc - South Coventry System
Ctwc - South Coventry System serves about 501 people through 141 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Tolland County, Connecticut. EPA system ID: CT0320051; phone on file: 860-944-9655. They can tell you what your service line is made of and whether they pay to replace it.
Ctwc - South Coventry System's lead record
Against the period ending 2025 (3 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Ctwc - South Coventry System is 11 ppb across 18 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3.2 ppb |
| 2025 | 3 ppb |
| 2025 | 3.9 ppb |
| 2024 | 1.2 ppb |
| 2024 | 2.6 ppb |
| 2023 | 2.6 ppb |
| 2023 | 2.8 ppb |
| 2022 | 4.3 ppb |
| 2022 | 3.4 ppb |
| 2021 | 8 ppb |
| 2020 | 1 ppb |
| 2019 | 2 ppb |
| 2018 | 3 ppb |
| 2018 | 2.5 ppb |
| 2017 | 2.1 ppb |
| 2017 | 3 ppb |
| 2017 | 2.2 ppb |
| 2016 | 11 ppb over 10 |
Against other Connecticut systems
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 - South Coventry System's 3.2 ppb sits at the 86th percentile in Connecticut and the 84th nationally (higher means more lead).
Nearby utilities
63 other systems share Tolland County; 13 of them have a higher latest lead result than Ctwc - South Coventry System. 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) |
| Woodhaven Apartments | 489 | 0.6 ppb |
| Vernon Village Inc. | 430 | 0 (not detected) |
| Stafford Hollow Water Association | 429 | 4.8 ppb |
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 - South Coventry System 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. Why sampled homes are the worst-case ones is in the guide to reading the number. The action level is dropping - the 10 ppb rule from 2027.