Public water system · WA5301971
ActiveLittle Diamond -Koa-Thousand Trails
At a glance
Little Diamond -Koa-Thousand Trails (PWSID WA5301971) is an active transient non-community water system in Pend Oreille County, Washington. It reports serving 100 people through 301 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in December 2010.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
100
Service connections
301
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Little Diamond -Koa-Thousand Trails compare with other water systems in Pend Oreille County?
By EPA's size categories, Little Diamond -Koa-Thousand Trails is a very small system (500 people or fewer). Pend Oreille County has 44 active public water systems. Its population served is about 61% below the county average of 259 people per system, and accounts for 0.9% 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 transient non-community water system reports serving 144 people, so Little Diamond -Koa-Thousand Trails is about 31% below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Washington has 1,913 active transient non-community water systems, 41% 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 Little Diamond -Koa-Thousand Trails?
EPA lists Little Diamond -Koa-Thousand Trails as privately owned. 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 privately owned.
Does Little Diamond -Koa-Thousand Trails have drinking water violations?
Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in December 2010. The violations listed here began between September 1993 and December 2010. By type: 8 contaminant level above the legal limit and 4 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (11 of them). EPA lists 10 as archived and 2 as resolved. 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. 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 |
|---|---|---|---|---|
| 2010-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2004-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2000-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 2000-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1999-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1997-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1997-07-01 | Monitoring and reportingMonitoring, Repeat Major (TCR) · code 25 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1997-06-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1996-12-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Archived |
| 1996-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1996-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1993-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
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.
Little Diamond -Koa-Thousand Trails: frequently asked questions
Who runs Little Diamond -Koa-Thousand Trails?
Little Diamond -Koa-Thousand Trails (PWSID WA5301971) is a transient non-community water system privately owned. It is regulated by the WA state drinking water program.
How many people does Little Diamond -Koa-Thousand Trails serve?
Little Diamond -Koa-Thousand Trails reports serving 100 people through 301 service connections in Pend Oreille County, Washington.
Where does Little Diamond -Koa-Thousand Trails 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 Little Diamond -Koa-Thousand Trails have any drinking water violations?
Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in December 2010. 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 Little Diamond -Koa-Thousand Trails' 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, 8 are health-based, and the most recent began in December 2010. For current results, consult EPA ECHO, or the WA state drinking water program.
Where can I find Little Diamond -Koa-Thousand Trails' water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Little Diamond -Koa-Thousand Trails is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
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 |
| Diamond Lake Water & Sewer District | Pend Oreille | 1,299 | 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 |
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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, “Little Diamond -Koa-Thousand Trails, PWSID WA5301971, Washington”, https://aquacensus.com/water-systems/washington/little-diamond-koa-thousand-trails-wa5301971 (data as of October 1, 2026).