Public water system · WA53AB860
ActiveGreen Acres - Mattawa
At a glance
Green Acres - Mattawa (PWSID WA53AB860) is an active non-transient non-community water system in Grant County, Washington. It reports serving 267 people through 14 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 6 violations for this system; 4 are health-based, and the most recent began in July 2009.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
267
Service connections
14
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Green Acres - Mattawa compare with other water systems in Grant County?
By EPA's size categories, Green Acres - Mattawa is a very small system (500 people or fewer). Grant County has 265 active public water systems. Its population served is about half of the county average of 543 people per system, and accounts for 0.2% of the 143,944 people reported by systems filed under the county. Across Washington, the 4,705 active systems average 2,172 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Green Acres - Mattawa is about 38% below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Washington has 400 active non-transient non-community water systems, 8.5% 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 Green Acres - Mattawa?
EPA lists Green Acres - Mattawa 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. 227 of the 265 active systems in Grant County (86%) are also privately owned.
Does Green Acres - Mattawa have drinking water violations?
EPA's records list 6 violations for this system; 4 are health-based, and the most recent began in July 2009. The violations listed here began between January 2007 and July 2009. By type: 4 contaminant level above the legal limit and 2 monitoring and reporting. The contaminant or rule involved most often is Nitrate (4 of them). EPA lists 5 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 |
|---|---|---|---|---|
| 2009-07-01 | Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2008-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 2008-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Diquatcode 2032 | No | Archived |
| 2008-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 2007-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 2007-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | 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.
Green Acres - Mattawa: frequently asked questions
Who runs Green Acres - Mattawa?
Green Acres - Mattawa (PWSID WA53AB860) is a non-transient non-community water system privately owned. It is regulated by the WA state drinking water program.
How many people does Green Acres - Mattawa serve?
Green Acres - Mattawa reports serving 267 people through 14 service connections in Grant County, Washington.
Where does Green Acres - Mattawa 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 Green Acres - Mattawa have any drinking water violations?
EPA's records list 6 violations for this system; 4 are health-based, and the most recent began in July 2009. 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 Green Acres - Mattawa'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; 4 are health-based, and the most recent began in July 2009. For current results, consult EPA ECHO, or the WA state drinking water program.
Where can I find Green Acres - Mattawa's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Green Acres - Mattawa is a non-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 Grant County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Moses Lake City of | Grant | 32,428 | Community | Groundwater |
| Gorge Amphitheatre | Grant | 25,119 | Transient non-community | Groundwater |
| Ephrata Water Department | Grant | 8,718 | Community | Groundwater |
| Quincy Water Department City of | Grant | 8,415 | Community | Groundwater |
| Mattawa City of | Grant | 5,370 | Community | Groundwater |
| Sun Lakes State Park | Grant | 4,858 | 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, “Green Acres - Mattawa, PWSID WA53AB860, Washington”, https://aquacensus.com/water-systems/washington/green-acres-mattawa-wa53ab860 (data as of October 1, 2026).