PHOENIX, AZ · Maricopa County
PHOENIX-K O SYSTEM Water System
Inactive system
This water system is marked inactive in EPA’s federal records as of December 1, 1994. 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 Maricopa 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)
- AZ0407041
- System type
- Community Water System
- Population served
- 200
- Service connections
- 50
- Ownership
- public/private mix
- Water source
- groundwater (wells)
PHOENIX-K O SYSTEM is one of 1,189 community water systems in Arizona in the 500 or fewer people size category, formerly serving 200 people from groundwater.
EPA's federal records list this system as inactive in 1994; the record below is historical.
As of August 1, 2026, its federal record holds 8 entries between 1985 and 1988, all of which EPA lists as closed. Nothing has been added since 1988.
All 8 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 inorganic chemicals.
Violation history
Monitoring, Regular
—Selenium
July 1, 1988 – September 30, 1988
ResolvedMonitoring, Regular
—Chromium
July 1, 1988 – September 30, 1988
ResolvedMonitoring, Regular
—Barium
July 1, 1988 – September 30, 1988
ResolvedMonitoring, Regular
—Cadmium
July 1, 1988 – September 30, 1988
ResolvedMonitoring, Regular
—Fluoride
July 1, 1988 – September 30, 1988
ResolvedMonitoring, Regular
—Mercury
July 1, 1988 – September 30, 1988
ResolvedMonitoring, Regular
—Nitrate
July 1, 1988 – September 30, 1988
ResolvedMonitoring, Regular
—Arsenic
October 2, 1985 – September 30, 1988
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| July 1, 1988 – September 30, 1988 | Monitoring, Regular | Selenium | — | Resolved |
| July 1, 1988 – September 30, 1988 | Monitoring, Regular | Chromium | — | Resolved |
| July 1, 1988 – September 30, 1988 | Monitoring, Regular | Barium | — | Resolved |
| July 1, 1988 – September 30, 1988 | Monitoring, Regular | Cadmium | — | Resolved |
| July 1, 1988 – September 30, 1988 | Monitoring, Regular | Fluoride | — | Resolved |
| July 1, 1988 – September 30, 1988 | Monitoring, Regular | Mercury | — | Resolved |
| July 1, 1988 – September 30, 1988 | Monitoring, Regular | Nitrate | — | Resolved |
| October 2, 1985 – September 30, 1988 | Monitoring, Regular | Arsenic | — | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- August 30, 1990State Compliance achieved13 linked violations
- September 24, 1980State Othergeneral compliance action — not tied to a specific violation on record
Last known contact on file (system is inactive)
Not on record
Phone not on record
PHOENIX, AZ 85003