Public water system · WA5319207
ActiveDiamond Lake Water & Sewer District
At a glance
Diamond Lake Water & Sewer District (PWSID WA5319207) is an active community water system in Pend Oreille County, Washington. It reports serving 1,299 people through 650 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 January 2024.
This page covers its drinking water system only; sewer and wastewater service are not part of EPA's drinking water records.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,299
Service connections
650
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Diamond Lake Water & Sewer District compare with other water systems in Pend Oreille County?
By EPA's size categories, Diamond Lake Water & Sewer District is a small system (501 to 3,300 people). Pend Oreille County has 44 active public water systems, and Diamond Lake Water & Sewer District is the 3rd-largest of them by population served. Its population served is about 5 times the county average of 259 people per system, and accounts for 11% of the 11,407 people reported by systems filed under the county. Across Washington, the 4,705 active systems average 2,172 people each. Nationally, the average active community water system reports serving 6,703 people, so Diamond Lake Water & Sewer District is well below 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. Washington has 2,392 active community water systems, 51% of the state's 4,705 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 4,370 Washington systems (93%) list groundwater as their primary source.
Who owns and regulates Diamond Lake Water & Sewer District?
EPA lists Diamond Lake Water & Sewer District as owned by a local government. The WA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 20 of the 44 active systems in Pend Oreille County (45%) are also owned by a local government.
Does Diamond Lake Water & Sewer District have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2024. The violations listed here began between January 2008 and January 2024. By type: 6 monitoring and reporting and 6 public notice, recordkeeping or other. The contaminant or rule involved most often is Consumer Confidence Rule (6 of them). EPA lists 11 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2024-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2018-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2017-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2015-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2014-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2013-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2012-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2009-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Archived |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Styrenecode 2996 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Tetrachloroethylenecode 2987 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Trichloroethylenecode 2984 | No | Resolved |
| 2008-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | 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.
Diamond Lake Water & Sewer District: frequently asked questions
Who runs Diamond Lake Water & Sewer District?
Diamond Lake Water & Sewer District (PWSID WA5319207) is a community water system owned by a local government. It is regulated by the WA state drinking water program.
How many people does Diamond Lake Water & Sewer District serve?
Diamond Lake Water & Sewer District reports serving 1,299 people through 650 service connections in Pend Oreille County, Washington.
Where does Diamond Lake Water & Sewer District 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 Diamond Lake Water & Sewer District 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 January 2024. 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 Diamond Lake Water & Sewer District'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 January 2024. For current results, consult the system's annual water quality report, EPA ECHO, or the WA state drinking water program.
Where can I find Diamond Lake Water & Sewer District's water quality report?
As a community water system, Diamond Lake Water & Sewer District 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 Pend Oreille County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Newport City of | Pend Oreille | 3,331 | Community | Groundwater |
| Ione Water Dept | Pend Oreille | 2,395 | Community | Groundwater |
| Cusick Town of | Pend Oreille | 672 | Community | Surface water |
| Metaline Falls Town of | Pend Oreille | 593 | Community | Surface water |
| Sullivan Lake Complex | Pend Oreille | 251 | Transient non-community | Groundwater |
| Ymca Camp Reed | Pend Oreille | 242 | Transient non-community | Groundwater under influence of surface water |
Related pages
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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, “Diamond Lake Water & Sewer District, PWSID WA5319207, Washington”, https://aquacensus.com/water-systems/washington/diamond-lake-water-sewer-district-wa5319207 (data as of October 1, 2026).