Coldwater Canyon 1

PWSID: AZ0413020

✓

No active violations
This system has no unresolved violations. The most recent violation on record was 2025-07-01.

This system has more violations on record than 89% of water systems in Arizona.

Violation trend: 6.0 per year over the last 5 years, similar to 5.6 per year in the previous 5.

System Details

Population Served	541
Service Connections	239
Water Source	Groundwater
System Type	Community Water System
Owner	Private
Status	Active
City	Tucson
EPA ZIP on File	85745

Areas Served

Black Canyon City, Yavapai County

Lead & Copper Testing

Contaminant	Level	EPA Action Level	Status
Lead (90th percentile)	0.0500 mg/L	0.015 mg/L	Exceeds Action Level
Lead (90th percentile)	0.0079 mg/L	0.015 mg/L	Below Action Level
Lead (90th percentile)	0.0022 mg/L	0.015 mg/L	Below Action Level
Lead (90th percentile)	0.0022 mg/L	0.015 mg/L	Below Action Level
Lead (90th percentile)	0.0000 mg/L	0.015 mg/L	Below Action Level
Lead (90th percentile)	0.0000 mg/L	0.015 mg/L	Below Action Level
Lead (90th percentile)	0.0000 mg/L	0.015 mg/L	Below Action Level
Lead (90th percentile)	0.0000 mg/L	0.015 mg/L	Below Action Level
Lead (90th percentile)	0.0000 mg/L	0.015 mg/L	Below Action Level
Lead (90th percentile)	0.0000 mg/L	0.015 mg/L	Below Action Level

Violation History (93 total)

Contaminant	Violation	Date	Health-Based	Status
1005	MR	2025-07-01	Major	Acknowledged
1005	MCL Measured: 0.0140 MG/L (limit: 0.0100 MG/L)	2023-04-01	Yes	Returned to Compliance
1005	MCL Measured: 0.0140 MG/L (limit: 0.0100 MG/L)	2023-04-01	Yes	Returned to Compliance
1005	MCL Measured: 0.0140 MG/L (limit: 0.0100 MG/L)	2023-04-01	Yes	Acknowledged
1005	MCL Measured: 0.0140 MG/L (limit: 0.0100 MG/L)	2023-04-01	Yes	Returned to Compliance
1005	MCL Measured: 0.0180 MG/L (limit: 0.0100 MG/L)	2023-01-01	Yes	Returned to Compliance
1005	MCL Measured: 0.0180 MG/L (limit: 0.0100 MG/L)	2023-01-01	Yes	Returned to Compliance
1005	MCL Measured: 0.0180 MG/L (limit: 0.0100 MG/L)	2023-01-01	Yes	Acknowledged
1005	MCL Measured: 0.0180 MG/L (limit: 0.0100 MG/L)	2023-01-01	Yes	Returned to Compliance
7500	Other	2022-11-14		Returned to Compliance
7500	Other	2022-11-14		Returned to Compliance
7500	Other	2022-11-14		Returned to Compliance
1005	MCL Measured: 0.0150 MG/L (limit: 0.0100 MG/L)	2022-10-01	Yes	Returned to Compliance
1005	MCL Measured: 0.0150 MG/L (limit: 0.0100 MG/L)	2022-10-01	Yes	Returned to Compliance
1005	MCL Measured: 0.0150 MG/L (limit: 0.0100 MG/L)	2022-10-01	Yes	Acknowledged
1005	MCL Measured: 0.0150 MG/L (limit: 0.0100 MG/L)	2022-10-01	Yes	Returned to Compliance
0999	MR	2022-10-01	Major	Returned to Compliance
0999	MR	2022-10-01	Major	Returned to Compliance
0999	MR	2022-10-01	Major	Returned to Compliance
0999	MR	2022-10-01	Major	Returned to Compliance
7000	Other	2022-07-01		Returned to Compliance
7000	Other	2022-07-01		Returned to Compliance
7000	Other	2022-07-01		Returned to Compliance
1005	MCL Measured: 0.0160 MG/L (limit: 0.0100 MG/L)	2022-07-01	Yes	Returned to Compliance
1005	MCL Measured: 0.0160 MG/L (limit: 0.0100 MG/L)	2022-07-01	Yes	Returned to Compliance
1005	MCL Measured: 0.0160 MG/L (limit: 0.0100 MG/L)	2022-07-01	Yes	Acknowledged
0999	MR	2022-04-01	Major	Returned to Compliance
0999	MR	2022-04-01	Major	Returned to Compliance
0999	MR	2022-04-01	Major	Returned to Compliance
0999	MR	2022-04-01	Major	Returned to Compliance
0999	MR	2020-04-01	Major	Returned to Compliance
0999	MR	2020-04-01	Major	Returned to Compliance
5000	MR	2019-10-01		Returned to Compliance
5000	MR	2019-10-01		Returned to Compliance
1005	MR	2019-10-01	Major	Returned to Compliance
1005	MR	2019-10-01	Major	Returned to Compliance
7000	Other	2019-07-01		Returned to Compliance
7000	Other	2019-07-01		Returned to Compliance
5000	MR	2018-10-01		Returned to Compliance
5000	MR	2018-10-01		Returned to Compliance
1005	MR	2018-07-01	Major	Returned to Compliance
1005	MR	2018-07-01	Major	Returned to Compliance
0999	MR	2018-07-01	Major	Returned to Compliance
0999	MR	2018-07-01	Major	Returned to Compliance
5000	MR	2017-11-03		Returned to Compliance
5000	MR	2017-11-03		Returned to Compliance
8000	MON	2017-10-01	Major	Returned to Compliance
8000	MON	2017-10-01	Major	Returned to Compliance
0999	MR	2016-10-01	Major	Returned to Compliance
0999	MR	2016-10-01	Major	Returned to Compliance

Showing 50 of 93 historical violations.

Understanding This Water System's Record

Coldwater Canyon 1 is a community water system water system that draws from groundwater sources and serves a population of 541 in Tucson, Arizona. This page shows its complete compliance history as reported to the EPA's Safe Drinking Water Information System (SDWIS), the federal database that tracks every public water system in the United States.

What Do These Violations Mean?

Health-based violations mean the system exceeded an EPA maximum contaminant level (MCL) or failed to provide required treatment. These indicate potential health risks from contaminants like lead, arsenic, bacteria, nitrates, or disinfection byproducts. Non-health-based violations involve monitoring, reporting, or procedural requirements — the system missed a testing deadline or failed to notify customers, but contaminant levels were not necessarily unsafe.

What Should You Do?

Your water utility is required to publish an annual Consumer Confidence Report (CCR) that details test results and any violations. If your system has active health-based violations, consider a certified water filter rated for the specific contaminants involved. The contaminant guides on this site explain health risks and filter options for common pollutants. For the most current results, contact your water utility directly — EPA data can lag weeks or months behind real-time testing.