Public water system · AZ0408078
ActiveWalnut Creek Water Company
At a glance
Walnut Creek Water Company (PWSID AZ0408078) is an active community water system in Mohave County, Arizona. It reports serving 728 people through 291 service connections. Its primary water source is groundwater, and EPA lists it as under public/private ownership. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
728
Service connections
291
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Walnut Creek Water Company compare with other water systems in Mohave County?
By EPA's size categories, Walnut Creek Water Company is a small system (501 to 3,300 people). Mohave County has 119 active public water systems. Its population served is about 63% below the county average of 1,948 people per system, and accounts for 0.3% of the 231,847 people reported by systems filed under the county. Across Arizona, the 1,769 active systems average 4,369 people each. Nationally, the average active community water system reports serving 6,703 people, so Walnut Creek Water Company is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Arizona has 936 active community water systems, 53% of the state's 1,769 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,612 Arizona systems (91%) list groundwater as their primary source.
Who owns and regulates Walnut Creek Water Company?
EPA lists Walnut Creek Water Company as under public/private ownership. The AZ state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 32 of the 119 active systems in Mohave County (27%) are also under public/private ownership.
Does Walnut Creek Water Company have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2022. The violations listed here began between November 2015 and October 2022. By type: 9 monitoring and reporting, 2 reporting and 1 monitoring. The contaminant or rule involved most often is Lead and Copper Rule (5 of them). EPA lists 12 as resolved. 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 |
|---|---|---|---|---|
| 2022-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2022-09-25 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2022-02-01 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2022-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2022-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2021-06-01 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2020-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2019-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2016-11-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2016-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2015-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
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.
Walnut Creek Water Company: frequently asked questions
Who runs Walnut Creek Water Company?
Walnut Creek Water Company (PWSID AZ0408078) is a community water system under public/private ownership. It is regulated by the AZ state drinking water program.
How many people does Walnut Creek Water Company serve?
Walnut Creek Water Company reports serving 728 people through 291 service connections in Mohave County, Arizona.
Where does Walnut Creek Water Company 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 Walnut Creek Water Company have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2022. 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 Walnut Creek Water Company'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. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in October 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the AZ state drinking water program.
Where can I find Walnut Creek Water Company's water quality report?
As a community water system, Walnut Creek Water Company must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Mohave County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Lake Havasu City of | Mohave | 54,610 | Community | Groundwater |
| Kingman Municipal Water | Mohave | 45,000 | Community | Groundwater |
| Bullhead City Mohave | Mohave | 36,330 | Community | Groundwater |
| Bermuda Water Company Inc. | Mohave | 25,000 | Community | Groundwater |
| Valley Pioneers Water Company Inc. | Mohave | 6,063 | Community | Groundwater |
| North Mohave Valley | Mohave | 5,190 | 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, “Walnut Creek Water Company, PWSID AZ0408078, Arizona”, https://aquacensus.com/water-systems/arizona/walnut-creek-water-company-az0408078 (data as of October 1, 2026).