Twin Hills Water District, CT
Lead detected, under the action levels
Latest 90th-percentile lead: 1.2 ppb (monitoring period 2022-2024). 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 Twin Hills Water District
Twin Hills Water District serves about 156 people through 39 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Tolland County, Connecticut. EPA system ID: CT0320061; phone on file: 860-337-6337. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2021 (2.1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Twin Hills Water District is 2.1 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 1.2 ppb |
| 2021 | 2.1 ppb |
| 2018 | 0 (not detected) |
How Twin Hills Water District compares
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. Twin Hills Water District's 1.2 ppb sits at the 61st percentile in Connecticut and the 58th nationally (higher means more lead).
Neighbouring systems
63 other systems share Tolland County; 27 of them have a higher latest lead result than Twin Hills Water District. 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; Bolton, 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 Twin Hills Water District 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. The action level is dropping - the 10 ppb rule from 2027.