Public water system · RI1858430
ActiveBlock Island Water Company
At a glance
Block Island Water Company (PWSID RI1858430) is an active community water system in Washington County, Rhode Island. It reports serving 9,999 people through 338 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
9,999
Service connections
338
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Block Island Water Company compare with other water systems in Washington County?
By EPA's size categories, Block Island Water Company is a medium system (3,301 to 10,000 people). Washington County has 188 active public water systems, and Block Island Water Company is the 6th-largest of them by population served. Its population served is about 9.8 times the county average of 1,022 people per system, and accounts for 5.2% of the 192,066 people reported by systems filed under the county. Across Rhode Island, the 465 active systems average 2,508 people each. Nationally, the average active community water system reports serving 6,703 people, so Block Island Water Company is about 49% above that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Rhode Island has 89 active community water systems, 19% of the state's 465 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 428 Rhode Island systems (92%) list groundwater as their primary source.
Who owns and regulates Block Island Water Company?
EPA lists Block Island Water Company as owned by a local government. The RI state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 26 of the 188 active systems in Washington County (14%) are also owned by a local government.
Does Block Island Water Company have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2023. The violations listed here began between July 2023 and July 2023. By type: 12 monitoring and reporting. The contaminants or rules involved are Di(2-ethylhexyl) adipate, Benzo(a)pyrene, Hexachlorobenzene and Heptachlor. EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Di(2-ethylhexyl) adipatecode 2035 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Benzo(a)pyrenecode 2306 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Hexachlorobenzenecode 2274 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Heptachlorcode 2065 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Alachlor (Lasso)code 2051 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Heptachlor epoxidecode 2067 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Lindane (gamma-BHC)code 2010 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Methoxychlorcode 2015 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Di(2-ethylhexyl) phthalatecode 2039 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Hexachlorocyclopentadienecode 2042 | No | Resolved |
| 2023-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
The 12 most recent violations in EPA's records, newest first. Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Block Island Water Company: frequently asked questions
Who runs Block Island Water Company?
Block Island Water Company (PWSID RI1858430) is a community water system owned by a local government. It is regulated by the RI state drinking water program.
How many people does Block Island Water Company serve?
Block Island Water Company reports serving 9,999 people through 338 service connections in Washington County, Rhode Island.
Where does Block Island Water Company get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Block Island Water Company have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2023. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Block Island Water Company's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the RI state drinking water program.
Where can I find Block Island Water Company's water quality report?
As a community water system, Block Island Water Company must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Washington County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Westerly Water Department | Washington | 35,298 | Community | Groundwater |
| North Kingstown Town of | Washington | 27,732 | Community | Groundwater |
| Veolia Water Wakefield Rhode Island Inc. | Washington | 22,347 | Community | Groundwater |
| University of Rhode Island | Washington | 19,354 | Community | Groundwater |
| Quonset Business Park | Washington | 13,000 | Non-transient non-community | Groundwater |
| Narragansett Water System-Point Judith | Washington | 8,210 | Community | Purchased groundwater |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Block Island Water Company, PWSID RI1858430, Rhode Island”, https://aquacensus.com/water-systems/rhode-island/block-island-water-company-ri1858430 (data as of October 1, 2026).