Casa Grande Union High School District (AZ): 95 Health Violations
15 ZIP codes · 35 water systems · 4,004,128 people served · Updated 2026-07-23
ZipCheckup's reading of EPA drinking-water data for Casa Grande Union High School District: 119 unresolved violations in the water systems serving this district.
Data: EPA SDWIS, NCES Last verified: 2026-07-23
Why School Water Quality Matters
Children drink 2–4× more water per pound of body weight than adults, making them more vulnerable to contaminants. School water quality affects students for hours every weekday.
Water Quality Overview
The Casa Grande Union High School District in Arizona spans 15 ZIP codes served by 35 community water systems, providing water to approximately 4,004,128 people.
The average Home Safety Score across the district is C (66/100)
- with the lowest-scoring area at 50/100 .
Water quality in this district falls in the bottom 55% nationally.
Why This Matters for Children
Children are more vulnerable to water contaminants than adults. The EPA and CDC identify these key risks:
- Lead exposure - Even low levels of lead can affect brain development, reduce IQ, and cause behavioral problems in children. There is no safe level of lead for children.
- PFAS ("forever chemicals") - Linked to immune system effects and developmental delays in children. Children drink more water relative to body weight than adults.
- Nitrate - Dangerous for infants (can cause "blue baby syndrome"). Agricultural areas often have elevated nitrate.
- Disinfection byproducts - Long-term exposure may increase cancer risk. School water fountains often have stagnant water that concentrates these compounds.
Lead Levels in the District
| Metric | Value | EPA Threshold |
|---|---|---|
| Average lead level (90th percentile) | 0.0023 mg/L | 0.015 mg/L |
| Highest lead level | 0.013 mg/L | 0.015 mg/L |
| ZIP codes exceeding EPA action level | 0 of 15 | - |
PFAS Contamination
Detected compounds: PFBS, PFPeA, PFBA, PFHxA, PFHpA, PFHxS, PFOS, PFOA.
Highest measured level: 0.0911 µg/L.
PFAS can accumulate in the body over time. Children's higher water intake relative to body weight makes them particularly susceptible. Reverse osmosis filters (NSF/ANSI 58) are the most effective at removing PFAS.
Learn more about PFAS in drinking water →
EPA Violation History
Contaminants of Concern
| Contaminant | Category | Violations | Health-Based | ZIPs Affected |
|---|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 99 | Yes | 8 |
| Lead | Inorganic | 81 | Yes | 11 |
| Revised Total Coliform Rule | Microbiological | 57 | No | 8 |
| Surface Water Treatment Rule | Treatment Technique | 38 | No | 8 |
| Lead and Copper Rule | Treatment Technique | 34 | No | 7 |
| Barium | Inorganic | 21 | Yes | 9 |
| Stage 2 DBP Rule | Treatment Technique | 18 | Yes | 8 |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 16 | No | 9 |
Radon Risk
Dominant radon zone: Zone 2 (Moderate risk)
Water Quality by ZIP Code
| ZIP Code | City | Safety Score | Violations | Health | Lead Level | Exceeds? |
|---|---|---|---|---|---|---|
| 85138 | Maricopa | C (58) | 72 | 27 | 0.00075 mg/L | No |
| 85139 | Maricopa | C (58) | 72 | 27 | 0.00075 mg/L | No |
| 85172 | Stanfield | D (50) | 55 | 26 | 0.00044 mg/L | No |
| 85131 | Eloy | B (79) | 54 | 1 | 0.0005 mg/L | No |
| 85128 | Coolidge | B (79) | 46 | 4 | 0.0015 mg/L | No |
| 85142 | Queen Creek | B (74) | 35 | 1 | 0.00225 mg/L | No |
| 85123 | Arizona City | C (56) | 32 | 4 | 0.013 mg/L | No |
| 85248 | Chandler | B (78) | 20 | 2 | 0.0031 mg/L | No |
| 85122 | Casa Grande | B (82) | 9 | 1 | 0.001 mg/L | No |
| 85193 | Casa Grande | B (82) | 9 | 1 | 0.001 mg/L | No |
| 85194 | Casa Grande | B (82) | 9 | 1 | 0.001 mg/L | No |
| 85121 | Bapchule | D (53) | 0 | 0 | — | — |
| 85147 | Sacaton | D (53) | 0 | 0 | — | — |
| 85339 | Laveen | C (55) | 0 | 0 | — | — |
| 85634 | Sells | D (53) | 0 | 0 | — | — |
Water Systems Serving This District
| Water System | Population Served | Source | ZIP Codes |
|---|---|---|---|
| PHOENIX CITY OF | 1,695,000 | Surface water | 85339 |
| TUCSON CITY OF | 732,906 | Groundwater | 85634 |
| Gilbert, Town of | 247,600 | Surface water | 85142 |
| CHANDLER CITY OF | 247,328 | Surface water | 85121, 85248 |
| Arizona Water Company - Pinal Valley | 134,432 | Groundwater | 85122, 85123, 85128 +6 more |
| Queen Creek Town of | 95,502 | Groundwater | 85142 |
| Epcor - San Tan | 87,435 | Groundwater | 85142 |
| Gw Santa Cruz Water Company | 84,000 | Groundwater | 85138, 85139 |
35 water systems total serve this district.
Lead Risk Assessment
Infrastructure Risk Factors
| Risk Factor | District Average | Why It Matters |
|---|---|---|
| Housing built before 1986 | 27.7% | Lead solder was used in plumbing until 1986 |
| Housing built before 1950 | 2.5% | Lead pipes were common before 1950 |
| Lead service line probability | 7.3% | Estimated chance of lead pipes connecting homes to water mains |
| Average lead level (90th pctl) | 0.0023 mg/L | EPA action level: 0.015 mg/L |
| Highest measured lead level | 0.013 mg/L | EPA action level: 0.015 mg/L |
Schools built before 1986 are especially at risk. Lead can leach from older pipes, fixtures, and solder joints into drinking water — particularly when water sits in pipes overnight or over weekends.
Detailed Violation History
| Contaminant | Category | Total Violations | Health-Based | ZIPs Affected |
|---|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 99 | Yes | 8 |
| Lead | Inorganic | 81 | Yes | 11 |
| Revised Total Coliform Rule | Microbiological | 57 | No | 8 |
| Surface Water Treatment Rule | Treatment Technique | 38 | No | 8 |
| Lead and Copper Rule | Treatment Technique | 34 | No | 7 |
| Barium | Inorganic | 21 | Yes | 9 |
| Stage 2 DBP Rule | Treatment Technique | 18 | Yes | 8 |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 16 | No | 9 |
| Stage 1 DBP Rule | Treatment Technique | 16 | No | 10 |
| Combined Radium | Radionuclides | 12 | Yes | 3 |
Most Recent Violations
- Violation in ZIP 85122 (Unknown date) — Unresolved
- Violation in ZIP 85122 (Unknown date) — Unresolved
- Violation in ZIP 85122 (Unknown date) — Unresolved
- Violation in ZIP 85122 (Unknown date) — Unresolved
- Violation in ZIP 85122 (Unknown date) — Unresolved
Is the Water Safe at Casa Grande Union High School District Schools?
Several factors warrant attention for families in the Casa Grande Union High School District area:
- Water systems in this district have recorded 95 health-based violations. These violations indicate contaminant levels that may pose health risks.
- PFAS ("forever chemicals") have been detected in 6 of 15 ZIP codes. Current levels are below EPA maximums.
- 119 violations remain unresolved, meaning the issues have not been officially corrected.
Important context: EPA compliance data measures water quality at the utility level. Individual school buildings — especially older ones — may have additional risks from internal plumbing, lead fixtures, and stagnant water in pipes.
What Parents Should Do
Testing
- Request your school's water testing results. Under the EPA's 3Ts program, schools are encouraged to test drinking water. Ask the Casa Grande Union High School District school board for the most recent results.
- Test your home water. If your home was built before 1986, lead may be present in your plumbing. Free or low-cost test kits are often available from your water utility.
- Ask about PFAS testing. PFAS have been detected in this district. Request specific PFAS testing results from your water utility.
Advocacy
- Attend school board meetings and ask about the district's water quality testing schedule and remediation plans.
- Request lead fixture replacement if your child's school was built before 1986 and hasn't upgraded its plumbing.
- Contact your water utility about the 119 unresolved violations in the district. Ask for a timeline for resolution.
Resources
- EPA 3Ts Program for Schools
- CDC — Lead in Drinking Water
- NSF Filter Certification Lookup
- EPA PFAS Information
ZIP Code Reports for This District
- 85138 — Maricopa (Grade: C), 72 violations
- 85139 — Maricopa (Grade: C), 72 violations
- 85172 — Stanfield (Grade: D), 55 violations
- 85131 — Eloy (Grade: B), 54 violations
- 85128 — Coolidge (Grade: B), 46 violations
- 85142 — Queen Creek (Grade: B), 35 violations
- 85123 — Arizona City (Grade: C), 32 violations
- 85248 — Chandler (Grade: B), 20 violations
- 85122 — Casa Grande (Grade: B), 9 violations
- 85193 — Casa Grande (Grade: B), 9 violations
- 85194 — Casa Grande (Grade: B), 9 violations
- 85121 — Bapchule (Grade: D), no violations
- 85147 — Sacaton (Grade: D), no violations
- 85339 — Laveen (Grade: C), no violations
- 85634 — Sells (Grade: D), no violations
What Parents Can Do
- Request lead testing at your child's school - The EPA's 3Ts program (Training, Testing, Taking Action) provides guidance for schools. Ask your school board about their water testing schedule.
- Review the Consumer Confidence Report (CCR) - Your water utility publishes this annually. It details all detected contaminants.
- Test your home's water - Especially if your home has older plumbing (pre-1986) that may contain lead solder or lead pipes.
- Address PFAS - If PFAS are detected in your area, a reverse osmosis or activated carbon block filter rated NSF/ANSI 53 or 58 can reduce levels significantly.
- Pack water from home - If you're concerned about school water quality, send your child with a water bottle filled at home (filtered if possible).
- Stay informed - Bookmark this page to check for updates on water quality in your school district.
Need help with school water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
Frequently Asked Questions
Is the water safe in Casa Grande Union High School District schools?
Water systems serving Casa Grande Union High School District have recorded 95 health-based violations in the past 5 years. While utilities are required to meet federal standards, individual school buildings may have older plumbing that can introduce contaminants. Parents should request lead testing results from their school.
Does Casa Grande Union High School District test for lead in school water?
Federal law does not require schools to test for lead in drinking water (except in some states with specific mandates). The EPA's voluntary 3Ts program encourages testing. Contact your school district office to ask about their testing schedule and results.
What level of lead is safe for children?
There is no safe level of lead for children, according to the CDC. The EPA action level of 0.015 mg/L (15 ppb) triggers corrective action for water systems, but the American Academy of Pediatrics recommends that school water contain no more than 0.001 mg/L (1 ppb).
Are there PFAS in Casa Grande Union High School District water?
Yes, PFAS have been detected in 6 of 15 ZIP codes served by this district. PFAS are "forever chemicals" that do not break down and can accumulate in the body. The EPA has set maximum contaminant levels for certain PFAS compounds. Reverse osmosis filters are the most effective at removing PFAS from drinking water.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- School districts: NCES EDGE Geographic Relationship Files
- PFAS: EPA ECHO
- Radon: EPA Map of Radon Zones
Updated daily.