Block Island Water Company, RI
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2024-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Block Island Water Company at a glance
Block Island Water Company serves about 9,999 people through 342 service connections, which makes it a medium-sized system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Washington County, Rhode Island. EPA system ID: RI1858430; phone on file: 401-466-3232. They can tell you what your service line is made of and whether they pay to replace it.
Block Island Water Company's lead record
Against the period ending 2023 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Block Island Water Company is 11.3 ppb across 5 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2017 | 0.8 ppb |
| 2016 | 11.3 ppb over 10 |
Where this result ranks
Of the 78 Rhode Island systems with a lead result, the median latest reading is 1.1 ppb; 6 are over 15 ppb right now and 17 have gone over at some point. Block Island Water Company's reported as 0 (not detected) sits at the 25th percentile in Rhode Island and the 37th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Washington County
32 other systems share Washington County; 25 of them have a higher latest lead result than Block Island Water Company. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Westerly Water Department | 35,298 | 3.6 ppb |
| North Kingstown Town Of | 27,732 | 1.3 ppb |
| Veolia Water Wakefield Rhode Island Inc | 21,225 | 3.2 ppb |
| University Of Rhode Island | 19,354 | 6.4 ppb |
| Narragansett Water System-Point Judith | 8,210 | 4.1 ppb |
| South Kingstown-South Shore | 6,170 | 1 ppb |
| Narragansett Water Dept-North End | 4,432 | 1.2 ppb |
| Kingston Water District | 3,968 | 1 ppb |
| Richmond, Town Of | 2,671 | 0.3 ppb |
| South Kingstown-Middlebridge | 694 | 1 ppb |
Your move
Look up your address in Block Island Water Company's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Block Island Water Company 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. A zero today does not rule out a jump later - the rules are tightening in 2027.