Local water dashboard
Official source aggregationRegional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Maricopa County.
Your tap water
Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.
172–302 ppm
Utility-reported hardness as CaCO₃ · 2025
Distribution-system range. The utility does not publish a single average in this table. Source blends and the time of year can change hardness at a property.
Read the utility’s source report ↗Page 4, aesthetic water quality analysis, Total Hardness. Source checked Sep 29, 2026.
At a glance
EPA quarter 2026Q2
Utility-reported hardness
172–302 ppm
Confirm your provider above
All possible systems
Review needed
1 active health-based record
Measurements by utility
Each result belongs to a specific system.
Utility match
9 systems
Serves 1,695,000 people system-wide
Match the name on your water bill
These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.
EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.
AZ0407025 · Surface water · 1,695,000 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Read 2025 Water Quality Report ↗An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
EPA SDWIS Lead and Copper Rule samples
18% of the listed benchmark
Monitoring period: Jan 1, 2022 to Dec 31, 2024
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Resolved | May 1, 2025 to May 31, 2025 |
| Surface Water Treatment Rule | Archived | May 1, 2025 to May 31, 2025 |
| Interim Enhanced Surface Water Treatment RuleHealth-based | Resolved | Jan 1, 2021 to Jan 12, 2021 |
AZ0407531 · Groundwater · 14,723 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
EPA SDWIS Lead and Copper Rule samples
0% of the listed benchmark
Monitoring period: Jan 1, 2022 to Dec 31, 2024
| Rule | Status | Period |
|---|---|---|
| Arsenic | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Radium-226 | Resolved | Jan 1, 2024 to Mar 31, 2024 |
| Radium-228 | Resolved | Jan 1, 2024 to Mar 31, 2024 |
| Combined Radium (-226 and -228) | Resolved | Jul 1, 2023 to Sep 30, 2023 |
| Gross Alpha, Excl. Radon and U | Resolved | Jul 1, 2023 to Sep 30, 2023 |
| Radium-228 | Resolved | Jul 1, 2023 to Sep 30, 2023 |
| Combined Uranium | Resolved | Jul 1, 2023 to Sep 30, 2023 |
| Radium-226 | Resolved | Jul 1, 2023 to Sep 30, 2023 |
| Arsenic | Resolved | Apr 1, 2023 to Jun 30, 2023 |
AZ0407065 · Groundwater · 6,202 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
EPA SDWIS Lead and Copper Rule samples
0% of the listed benchmark
Monitoring period: Jan 1, 2021 to Dec 31, 2023
| Rule | Status | Period |
|---|---|---|
| Chlorine | Resolved | Oct 1, 2023 to Dec 31, 2023 |
| Chlorine | Resolved | Jan 1, 2023 to Mar 31, 2023 |
AZ0407700 · Groundwater · 1,500 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
EPA SDWIS Lead and Copper Rule samples
0% of the listed benchmark
Monitoring period: Jan 1, 2025 to Dec 31, 2025
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Archived | Dec 1, 2025 to Dec 31, 2025 |
| Chlorine | Archived | Oct 1, 2025 to Oct 31, 2025 |
| Public Notice | Resolved | Dec 20, 2024 to Feb 12, 2025 |
| LEAD AND COPPER RULE REVISIONS | Resolved | Oct 17, 2024 to Apr 17, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | Resolved | Oct 17, 2024 to Apr 17, 2025 |
| Public Notice | Resolved | Feb 16, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Public Notice | Resolved | Feb 8, 2024 to Jul 1, 2024 |
| Chlorine | Resolved | Jan 1, 2024 to Jan 31, 2024 |
| E. COLI | Resolved | Aug 2, 2023 to Jul 1, 2024 |
| Chlorine | Resolved | Jul 1, 2023 to Sep 30, 2023 |
| Revised Total Coliform RuleHealth-based | Resolved | May 1, 2021 to May 31, 2021 |
AZ0407307 · Groundwater · 680 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
EPA SDWIS Lead and Copper Rule samples
0% of the listed benchmark
Monitoring period: Jan 1, 2023 to Dec 31, 2025
| Rule | Status | Period |
|---|---|---|
| Lead and Copper Rule | Unaddressed | Jan 1, 2026 |
| Public Notice | Resolved | Dec 20, 2024 to Feb 26, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | Resolved | Oct 17, 2024 to Feb 26, 2025 |
| LEAD AND COPPER RULE REVISIONS | Resolved | Oct 17, 2024 to Feb 26, 2025 |
| Chlorine | Resolved | Oct 1, 2022 to Dec 31, 2022 |
| Consumer Confidence Rule | Resolved | Jul 1, 2022 to Jul 19, 2022 |
| Chlorine | Resolved | Jan 1, 2022 to Mar 31, 2022 |
AZ0407682 · Groundwater · 500 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
EPA SDWIS Lead and Copper Rule samples
0% of the listed benchmark
Monitoring period: Jan 1, 2024 to Dec 31, 2024
EPA SDWIS reported health-based violation
110% of the listed benchmark
Monitoring period: Jan 1, 2026 to Mar 31, 2026
| Rule | Status | Period |
|---|---|---|
| ArsenicHealth-based | Archived | Jan 1, 2026 to Mar 31, 2026 |
| Consumer Confidence Rule | Resolved | Oct 2, 2025 to Nov 17, 2025 |
| ArsenicHealth-based | Resolved | Apr 1, 2022 to Jun 30, 2022 |
| ArsenicHealth-based | Resolved | Jan 1, 2022 to Mar 31, 2022 |
AZ0407621 · Groundwater · 400 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
EPA SDWIS Lead and Copper Rule samples
93% of the listed benchmark
Monitoring period: Jan 1, 2022 to Dec 31, 2024
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Resolved | Nov 1, 2025 to Jan 20, 2026 |
| Revised Total Coliform Rule | Resolved | Aug 1, 2025 to Oct 20, 2025 |
| LEAD AND COPPER RULE REVISIONS | Unaddressed | Jul 2, 2025 |
AZ0407511 · Groundwater · 96 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
EPA SDWIS Lead and Copper Rule samples
7% of the listed benchmark
Monitoring period: Jan 1, 2023 to Dec 31, 2025
| Rule | Status | Period |
|---|---|---|
| Revised Total Coliform Rule | Resolved | May 1, 2021 to Jun 18, 2021 |
AZ0407280 · Groundwater · 40 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
1 reported active health-based record(s) for this system
Find this utility’s official report →An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
EPA SDWIS Lead and Copper Rule samples
17% of the listed benchmark
Monitoring period: Jan 1, 2025 to Dec 31, 2025
| Rule | Status | Period |
|---|---|---|
| Public Notice | Unaddressed | Nov 16, 2025 |
| Groundwater RuleHealth-based | Unaddressed | Oct 29, 2025 |
| Consumer Confidence Rule | Resolved | Oct 2, 2025 to Mar 31, 2026 |
| Consumer Confidence Rule | Resolved | Jul 1, 2025 to Jul 1, 2025 |
| Public Notice | Unaddressed | Dec 20, 2024 |
| LEAD AND COPPER RULE REVISIONS | Resolved | Oct 17, 2024 to Mar 26, 2026 |
| LEAD AND COPPER RULE REVISIONSHealth-based | Resolved | Oct 17, 2024 to Mar 26, 2026 |
| Revised Total Coliform Rule | Resolved | Nov 1, 2023 to Nov 30, 2023 |
| Revised Total Coliform Rule | Resolved | Nov 1, 2023 to Dec 28, 2023 |
Hardness meter
54
PPM as CaCO₃
Soft
PPM
54
GPG
3.2
Regional environmental evidence
USGS hardness classification scale
54 PPM
Parts per million
54
mg/L as CaCO₃ equivalent
Grains per gallon
3.2
1 GPG ≈ 17.1 PPM
How to use regional evidence
These samples describe nearby environmental water. They cannot establish whether your tap water is soft or hard. Use a utility result or a tap test for appliance settings and treatment sizing.
USGS sites used
11
Nearest site
0.9 mi
Observation range
Nov 29, 2018–Jul 26, 2022
Regional evidence confidence
Moderate
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: DUNLAP AND 7TH AVENUE @ PHOENIX, AZ (Stream).USGS source documentation ↗Evidence tier: Regional environmental evidence. This value is not used as proof of the serving utility's treated-water hardness.
Regional context
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Phoenix median
54 PPM
About the same47 indexed ZIP readings · Range 44–64 PPM
Arizona median
64 PPM
10 PPM lower213 indexed ZIP readings · Range 33–2680 PPM
Evidence-first next steps
This profile can help you ask the right question. It cannot select equipment for a property without a current result from the serving utility or the tap.
ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.
An active health-based record is present. Follow the utility's current notice and public-health instructions.
Read City of Phoenix Water Services’s report ↗Use a tap hardness test before sizing a softener. For health concerns, use a certified laboratory and the correct sampling protocol.
Convert your hardness test result →Nearby indexed reports
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
EPA ECHO reports 1 active health-based violation among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
See the utility-reported ranges above and confirm which provider serves you. Values can vary within a system and over time.
Confirm hardness at your tap and consider actual scale or spotting before choosing treatment. Regional environmental values cannot determine whether you need a softener. A softener addresses hardness, not every contaminant.