Mahaffey

Transient non-community water system in Cowlitz County, Washington, drawing primarily on groundwater.

Dataset updated July 2026 . Source: EPA SDWIS/ECHO public records.

Population served

Service connections

Primary source

Groundwater

System type

TNCWS

Transient non-community water system

System record

PWSIDWA5350290

System typeTransient non-community water system

Activity statusActive

Population served49

Service connections23

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyWA state drinking water program

City served—

StateWashington

ZIP—

CountyCowlitz County →

Violations & enforcement

Began	Violation	Contaminant	Health-based	Status
2005-01-01	03	1040	No	Resolved
2000-09-01	23	3100	No	Archived
1999-12-01	23	3100	No	Archived
1979-10-01	03	4000	No	Archived
1979-10-01	03	1025	No	Archived
1979-10-01	03	1020	No	Archived
1979-10-01	03	1035	No	Archived
1979-10-01	03	1045	No	Archived
1979-10-01	03	1010	No	Archived
1979-10-01	03	1040	No	Archived
1979-10-01	03	1005	No	Archived
1979-10-01	03	1015	No	Archived

Mahaffey: frequently asked questions

Is Mahaffey's water safe to drink?

Mahaffey is an active transient non-community water system regulated under the Safe Drinking Water Act, overseen by the WA state drinking water program. EPA SDWA violation and enforcement records for this system are being added to AquaCensus from EPA ECHO; consult EPA ECHO or your annual Consumer Confidence Report for its current compliance status.

Who runs Mahaffey?

Mahaffey (PWSID WA5350290) is a private-owned transient non-community water system, regulated by the WA state drinking water program.

How many people does Mahaffey serve?

Mahaffey reports serving 49 people through 23 service connections in Cowlitz County, Washington.

Where does Mahaffey get its water?

EPA SDWIS lists this system's primary water source as groundwater.

Other water systems in Cowlitz County

Water system	County	Population served	Type	Source
Longview Water Department	Cowlitz	49,111	Community	Groundwater
Kelso City of	Cowlitz	15,775	Community	Groundwater under influence of surface water
Beacon Hill Water & Sewer District	Cowlitz	11,969	Community	Purchased groundwater
Woodland City of	Cowlitz	10,640	Community	Groundwater under influence of surface water
Kalama City of	Cowlitz	8,020	Community	Groundwater under influence of surface water
Castle Rock Municipal Water	Cowlitz	4,367	Community	Surface water