Tap Water Quality Report
Tap water quality in CASA GRANDE, Arizona
Tap water in CASA GRANDE, Arizona receives a grade of D (66/100) from TapWaterSafety.org. It's served by ARIZONA WATER CO - PINAL VALLEY. The most significant water quality concerns are: Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Arsenic significantly above health guideline; Chromium (hexavalent) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in CASA GRANDE's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving CASA GRANDE.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 1.15 ppt, 1150x above the EWG health guideline of 0.001 ppt.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 4.58 ppb, 1146x above the EWG health guideline of 0.004 ppb.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 6.82 ppb, 341x above the EWG health guideline of 0.02 ppb.
EPA compliance record
Official U.S. EPA records for ARIZONA WATER CO - PINAL VALLEY (system ID AZ0411009) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Arsenic Rule | Missed testing or reporting | 04/01/2025 | Open |
| Ground Water Rule | Missed testing or reporting | 08/20/2025 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for CASA GRANDE
Filters matched to the specific contaminants in CASA GRANDE's water supply.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
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All contaminants detected in CASA GRANDE's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) PFAS |
1.15 ppt | 0.001 | 10.0 | — | — | — | — | 1150× over |
| Arsenic Heavy metal |
4.58 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 1146× over |
| Chromium (hexavalent) Heavy metal |
6.82 ppb | 0.02 | — | — | — | — | — | 341× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
17.1 ppb | 0.15 | 80.0 | 100 | — | — | — | 114× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
4.52 ppb | 0.06 | — | — | — | — | — | 75× over |
| Nitrate Inorganic |
5.65 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 40× over |
| Nitrate and nitrite Inorganic |
5.55 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 40× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
2.01 ppb | 0.1 | 60.0 | 60 | — | — | — | 20× over |
| Radium, combined (-226 and -228) Radiological |
0.05 pCi/L | 0.05 | 5.0 | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
167.0 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
7.69 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
2.91 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
47.3 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Selenium Heavy metal |
1.51 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
18.6 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
3.91 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
3.87 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
3.33 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.254 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
1.6 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
1.41 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
8.71 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
1.28 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.798 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
217.8 ppb | — | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from ARIZONA WATER CO - PINAL VALLEY.