MARICOPA, AZ · Pinal County

MARICOPA MTN WTR CO-WEST Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of February 1, 2000. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.

If you are a resident looking for your current water provider, see water systems in Pinal County, AZ.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Arizona’s official records. Always confirm current status with Arizona before making decisions based on this information.

System facts

System ID (PWSID): AZ0411108
System type: Community Water System
Population served: 350
Service connections: 1
Ownership: public/private mix
Water source: groundwater (wells)

MARICOPA MTN WTR CO-WEST is one of 1,189 community water systems in Arizona in the 500 or fewer people size category, formerly serving 350 people from groundwater.

EPA's federal records list this system as inactive in 2000; the record below is historical.

As of August 1, 2026, its federal record holds 8 entries between 1984 and 1988, all of which EPA lists as closed. Nothing has been added since 1988.

Of the 8, 4 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Radionuclides and Revised Rad Rule and inorganic chemicals.

Violation history

Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
December 31, 1988 – March 30, 1989
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Gross Alpha, Excl. Radon and U
April 21, 1988 – April 20, 1992
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 22, 1987 – January 21, 1988
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Gross Alpha, Excl. Radon and U
July 23, 1987 – July 22, 1990
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Gross Alpha, Excl. Radon and U
April 2, 1987 – April 1, 1991
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Gross Alpha, Excl. Radon and U
January 15, 1987 – January 14, 1991
Archived
Monitoring, Regular
—
Arsenic
July 1, 1984 – June 30, 1985
Archived
Monitoring, Regular
—
Nitrate
July 1, 1984 – June 30, 1985
Archived

Archived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
December 31, 1988 – March 30, 1989	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived
April 21, 1988 – April 20, 1992	Maximum Contaminant Level Violation, Single Sample	Gross Alpha, Excl. Radon and U	Health-based	Archived
October 22, 1987 – January 21, 1988	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived
July 23, 1987 – July 22, 1990	Maximum Contaminant Level Violation, Single Sample	Gross Alpha, Excl. Radon and U	Health-based	Archived
April 2, 1987 – April 1, 1991	Maximum Contaminant Level Violation, Single Sample	Gross Alpha, Excl. Radon and U	Health-based	Archived
January 15, 1987 – January 14, 1991	Maximum Contaminant Level Violation, Single Sample	Gross Alpha, Excl. Radon and U	Health-based	Archived
July 1, 1984 – June 30, 1985	Monitoring, Regular	Arsenic	—	Archived
July 1, 1984 – June 30, 1985	Monitoring, Regular	Nitrate	—	Archived

Archived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

No enforcement actions on record for this system.

Last known contact on file (system is inactive)

Not on record

Phone not on record

MARICOPA, AZ 85239