Water Quality Report · Updated May 12, 2026
GW SANTA CRUZ WATER CO
GW SANTA CRUZ WATER CO delivers tap water graded D (58/100) by TapWaterSafety.org. The utility serves approximately 84,000 residents in MARICOPA, Arizona using groundwater. The most significant water quality concerns are: Arsenic significantly above health guideline; Chromium (hexavalent) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. For questions, the utility can be reached at 480-328-9281.
Is MARICOPA tap water safe to drink?
GW SANTA CRUZ WATER CO delivers tap water that earns a grade of D (58/100) from TapWaterSafety.org — a below-average rating, with multiple concerns including arsenic significantly above health guideline.
The utility serves 84,000 residents in MARICOPA, drawing from groundwater.
Public testing data identifies 9 contaminants in this water above EWG's health-based guidelines, including: Arsenic, Chromium (hexavalent), Total trihalomethanes (TTHMs), Haloacetic acids (HAA9), Nitrate and nitrite, Nitrate, Haloacetic acids (HAA5), Uranium, Radium, combined (-226 and -228). For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for MARICOPA residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for GW SANTA CRUZ WATER CO.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 7.11 ppb, 1777x above the EWG health guideline of 0.004 ppb.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 6.3 ppb, 315x above the EWG health guideline of 0.02 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 14.0 ppb, 93x above the EWG health guideline of 0.15 ppb.
Contact GW SANTA CRUZ WATER CO
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for MARICOPA
Filters matched to the specific contaminants in this water supply.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 58/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 |
|---|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
7.11 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 1777× over |
| Chromium (hexavalent) Heavy metal |
6.3 ppb | 0.02 | — | — | — | — | — | 315× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
14.0 ppb | 0.15 | 80.0 | 100 | — | — | — | 93× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
4.4 ppb | 0.06 | — | — | — | — | — | 73× over |
| Nitrate and nitrite Inorganic |
6.7 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 48× over |
| Nitrate Inorganic |
6.03 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 43× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
1.84 ppb | 0.1 | 60.0 | 60 | — | — | — | 18× over |
| Uranium Radiological |
7.07 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 16× over |
| Radium, combined (-226 and -228) Radiological |
0.09 pCi/L | 0.05 | 5.0 | — | — | — | — | 1.8× over |
| Chlorate Disinfection byproduct |
148.0 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
7.18 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
3.6 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
2.13 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.0388 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Fluoride Inorganic |
1.25 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.78 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
179.0 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
GW SANTA CRUZ WATER CO service area
This water system serves 1 community in Pinal County, Arizona. Click any city for its dedicated tap water quality page.
Find the right filter for MARICOPA water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.