Water Quality in 85138 — Maricopa, AZ
EPA data for GW SANTA CRUZ WATER CO
Data source: U.S. Environmental Protection Agency (EPA) SDWIS Last verified: March 16, 2026
Your Water System
ZIP code 85138 in Maricopa, Arizona is served by GW SANTA CRUZ WATER CO (EPA ID: AZ0411131). This system provides water to approximately 84,000 people from groundwater sources.
There are 40 community water systems serving this area.
Lead & Copper in Your Water
No Lead & Copper Rule sampling data available for systems serving this ZIP code.
Violation Summary
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| September 27, 2025 | Lead and Copper Rule | Monitoring | Unresolved |
| August 1, 2025 | Consumer Confidence Report Rule | Health-based | Unresolved |
| July 19, 2025 | Lead and Copper Rule | Monitoring | Resolved |
| July 19, 2025 | Lead and Copper Rule | Monitoring | Resolved |
| July 19, 2025 | Lead and Copper Rule | Monitoring | Resolved |
| July 19, 2025 | Lead and Copper Rule | Monitoring | Resolved |
| July 1, 2025 | Lead | Health-based | Unresolved |
| April 1, 2025 | Lead | Health-based | Unresolved |
| April 1, 2025 | Lead and Copper Rule | Monitoring | Resolved |
| January 1, 2025 | Lead | Health-based | Unresolved |
| January 1, 2025 | Lead | Health-based | Unresolved |
| December 20, 2024 | Lead and Copper Rule | Monitoring | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Resolved |
| October 1, 2024 | Lead | Health-based | Unresolved |
| August 1, 2024 | Revised Total Coliform Rule | Monitoring | Unresolved |
| August 1, 2024 | Revised Total Coliform Rule | Monitoring | Resolved |
| August 1, 2024 | Revised Total Coliform Rule | Monitoring | Resolved |
| August 1, 2024 | Revised Total Coliform Rule | Monitoring | Resolved |
| July 1, 2024 | Lead | Health-based | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for water systems serving this ZIP code:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Lead | Inorganic | 36 | Yes |
| Consumer Confidence Report Rule | Reporting | 21 | Yes |
| Revised Total Coliform Rule | Microbiological | 21 | No |
| Lead and Copper Rule | Treatment Technique | 19 | No |
| Combined Radium | Radionuclides | 15 | Yes |
| Barium | Inorganic | 12 | Yes |
| Radium-228 | Radionuclides | 10 | No |
| Gross Alpha | Radionuclides | 10 | No |
| Gross Beta | Radionuclides | 10 | No |
| Radium-226 | Radionuclides | 10 | No |
| Nickel | Inorganic | 9 | No |
| Cadmium | Inorganic | 8 | No |
| Chromium | Inorganic | 8 | No |
| Fluoride | Inorganic | 8 | No |
| Selenium | Inorganic | 8 | No |
Need help with your water quality?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| GW SANTA CRUZ WATER CO | AZ0411131 | 84,000 | Groundwater |
| GW FARMERS WATER CO - CONTINENTAL | AZ0410049 | 5,592 | Groundwater |
| GW FARMERS WATER CO - SANTA RITA SPRINGS | AZ0410213 | 3,990 | Groundwater |
| GW SANTA CRUZ WATER CO - RED ROCK | AZ0411160 | 3,813 | Groundwater |
| GW SAGUARO DIST WATER CO - LAS QUINTAS | AZ0410064 | 3,720 | Groundwater |
What You Can Do
- Request your water system’s Consumer Confidence Report (CCR) — Your utility is required to publish this annually
- Consider a home water test — Independent testing can reveal issues in your specific plumbing
- Install a certified water filter — NSF-certified filters can address specific contaminants
- Contact your water provider — Ask about current treatment and any ongoing remediation
Need help with water testing or filtration?
Call to get connected with a local professional in your area.
Call (855) 384-4856This is a free service. You will be connected with an independent service provider.
Other Water Quality Reports in Arizona
- 85001 (Phoenix) — 248 violations
- 85117 (Apache Junction) — 263 violations
- 85122 (Casa Grande) — 52 violations
- 85123 (Arizona City) — 94 violations
- 85127 (Chandler Heights) — 6 violations
- 85128 (Coolidge) — 101 violations
- 85131 (Eloy) — 139 violations
- 85132 (Florence) — 109 violations
- 85135 (Hayden) — 91 violations
- 85137 (Kearny) — 82 violations
- 85140 (San Tan Valley) — 90 violations
- 85141 (Picacho) — 88 violations
- 85142 (Queen Creek) — 70 violations
- 85145 (Red Rock) — 43 violations
- 85172 (Stanfield) — 92 violations
- 85173 (Superior) — 11 violations
- 85201 (Mesa) — 38 violations
- 85224 (Chandler) — 259 violations
- 85233 (Gilbert) — 364 violations
- 85250 (Scottsdale) — 34 violations
Nearby Water Quality Reports
- 85172 (Stanfield) — 9 mi — 92 violations
- 85122 (Casa Grande) — 13 mi — 52 violations
- 85127 (Chandler Heights) — 20 mi — 6 violations
- 85224 (Chandler) — 23 mi — 259 violations
- 85123 (Arizona City) — 23 mi — 94 violations
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for GW SANTA CRUZ WATER CO (AZ0411131) on EPA.gov.
Frequently Asked Questions
Is the tap water in 85138 safe to drink?
Maricopa’s water system has recorded 42 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
Where does 85138’s water come from?
The primary water source for this area is groundwater. GW SANTA CRUZ WATER CO serves approximately 84,000 people.
How can I get my water tested?
Contact your local water utility for a free water quality report, or hire a certified lab for independent home water testing. The EPA recommends testing annually if you use a private well.
Does 85138 have lead in the water?
No Lead and Copper Rule sampling data is currently available in EPA records for water systems serving ZIP code 85138. If you are concerned about lead, contact your water utility or have your tap water independently tested.
What is the radon risk in 85138?
Radon zone data is not available for ZIP code 85138. The EPA recommends testing all homes for radon regardless of location, as radon levels can vary significantly even within the same neighborhood.