Public water system · ME0091300
ActivePortland Water District-Greater
At a glance
Portland Water District-Greater (PWSID ME0091300) is an active community water system in Cumberland County, Maine. It reports serving 135,068 people through 54,027 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 6 violations for this system; none is health-based, and the most recent began in October 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
135,068
Service connections
54,027
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Portland Water District-Greater compare with other water systems in Cumberland County?
By EPA's size categories, Portland Water District-Greater is a very large system (more than 100,000 people). Cumberland County has 225 active public water systems, and Portland Water District-Greater is the largest of them by population served. Its population served is about 140 times the county average of 967 people per system, and accounts for 62% of the 217,594 people reported by systems filed under the county. Across Maine, the 1,862 active systems average 503 people each. Nationally, the average active community water system reports serving 6,703 people, so Portland Water District-Greater is about 20 times 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. Maine has 386 active community water systems, 21% of the state's 1,862 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 61 Maine systems (3.3%) list surface water as their primary source.
Who owns and regulates Portland Water District-Greater?
EPA lists Portland Water District-Greater as owned by a local government. The ME state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 24 of the 225 active systems in Cumberland County (11%) are also owned by a local government.
Does Portland Water District-Greater have drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in October 2022. The violations listed here began between April 2021 and October 2022. By type: 6 monitoring and reporting. The contaminant or rule involved most often is Bromate (2 of them). EPA lists 6 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 |
|---|---|---|---|---|
| 2022-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Bromatecode 1011 | No | Resolved |
| 2022-10-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2022-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2021-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 2021-04-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Bromatecode 1011 | No | Resolved |
All 6 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.
Portland Water District-Greater: frequently asked questions
Who runs Portland Water District-Greater?
Portland Water District-Greater (PWSID ME0091300) is a community water system owned by a local government. It is regulated by the ME state drinking water program.
How many people does Portland Water District-Greater serve?
Portland Water District-Greater reports serving 135,068 people through 54,027 service connections in Cumberland County, Maine.
Where does Portland Water District-Greater get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Portland Water District-Greater have any drinking water violations?
EPA's records list 6 violations for this system; none is health-based, and the most recent began in October 2022. 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 Portland Water District-Greater'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. EPA's records list 6 violations for this system; none is health-based, and the most recent began in October 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the ME state drinking water program.
Where can I find Portland Water District-Greater's water quality report?
As a community water system, Portland Water District-Greater 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 Cumberland County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Brunswick/Topsham Water District | Cumberland | 18,863 | Community | Groundwater |
| Yarmouth Water District | Cumberland | 8,000 | Community | Groundwater |
| Bridgton Water District | Cumberland | 3,660 | Community | Groundwater |
| Maine Water Company Freeport Division | Cumberland | 2,700 | Community | Groundwater |
| Gray Water District | Cumberland | 2,468 | Community | Groundwater |
| Point Sebago Outdoor Resort | Cumberland | 1,833 | Transient non-community | 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, “Portland Water District-Greater, PWSID ME0091300, Maine”, https://aquacensus.com/water-systems/maine/portland-water-district-greater-me0091300 (data as of October 1, 2026).