Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Mohave Valley, AZ 86440
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Mohave County.
Historical measurement record needs context
- Largest possible serving system
- Epcor - Willow Valley/king Street
- Source water
- Groundwater
- County
- Mohave County
- Profile updated
Your tap water
What does the utility report?
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.
Utility hardness unavailable in this index
Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.
Find an official utility report →At a glance
What the current records say
EPA quarter 2026Q2
All possible systems
No active flag
0 active health-based records
Measurements by utility
Each result belongs to a specific system.
Utility match
3 systems
Serves 3,408 people system-wide
Match the name on your water bill
Your utility’s measurements and compliance records
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.
Epcor - Willow Valley/king Street
AZ0408040 · Groundwater · 3,408 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 →Measurements (2)
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.
Lead (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 0 mg/L
- Action level
- 0.015 mg/L
0% of the listed benchmark
Monitoring period: Jan 1, 2021 to Dec 31, 2023
Copper (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 3.3 mg/L
- Action level
- 1.3 mg/L
254% of the listed benchmark
Monitoring period: Jan 1, 2006 to Dec 31, 2008
Violation history (7)
| Rule | Status | Period |
|---|---|---|
| LEAD AND COPPER RULE REVISIONS | Unaddressed | Jul 2, 2025 |
| ChloriteHealth-based | Resolved | Apr 1, 2025 to Apr 30, 2025 |
| Chlorite | Resolved | Dec 1, 2022 to Dec 31, 2022 |
| Chlorite | Resolved | Jun 1, 2022 to Jun 30, 2022 |
| TTHM | Resolved | Oct 1, 2021 to Dec 31, 2021 |
| Total Haloacetic Acids (HAA5) | Resolved | Oct 1, 2021 to Dec 31, 2021 |
| Chlorine | Resolved | Jan 1, 2021 to Mar 31, 2021 |
Epcor - Willow Valley/lake Cimarron
AZ0408129 · Groundwater · 596 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 →Measurements (2)
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.
Lead (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 0 mg/L
- Action level
- 0.015 mg/L
0% of the listed benchmark
Monitoring period: Jan 1, 2022 to Dec 31, 2024
Copper (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 1.4 mg/L
- Action level
- 1.3 mg/L
108% of the listed benchmark
Monitoring period: Jan 1, 2007 to Dec 31, 2009
Violation history (3)
| Rule | Status | Period |
|---|---|---|
| Chlorite | Resolved | Mar 1, 2023 to Mar 31, 2023 |
| Chlorite | Resolved | Dec 1, 2022 to Dec 31, 2022 |
| Total Haloacetic Acids (HAA5) | Resolved | Feb 1, 2022 to Apr 30, 2022 |
Rio Vista Ranches
AZ0408333 · Groundwater · 59 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 →Measurements (1)
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.
Lead (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 0.0016 mg/L
- Action level
- 0.015 mg/L
11% of the listed benchmark
Monitoring period: Jan 1, 2023 to Dec 31, 2025
Violation history (19)
| Rule | Status | Period |
|---|---|---|
| Public Notice | Resolved | Aug 2, 2025 to Oct 23, 2025 |
| Public Notice | Resolved | Jul 30, 2025 to Oct 23, 2025 |
| Consumer Confidence Rule | Resolved | Jul 1, 2025 to Oct 15, 2025 |
| Public Notice | Resolved | Dec 20, 2024 to Mar 28, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | Resolved | Oct 17, 2024 to Jul 7, 2025 |
| LEAD AND COPPER RULE REVISIONS | Resolved | Oct 17, 2024 to Jul 7, 2025 |
| Consumer Confidence Rule | Resolved | Oct 2, 2024 to Oct 7, 2025 |
| Revised Total Coliform Rule | Resolved | Jul 1, 2024 to Jul 31, 2024 |
| Revised Total Coliform Rule | Resolved | Jun 1, 2024 to Jun 30, 2024 |
| Public Notice | Resolved | Jan 2, 2024 to Oct 23, 2025 |
| Total Haloacetic Acids (HAA5) | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| TTHM | Resolved | Jan 1, 2024 to Dec 31, 2024 |
| Public Notice | Resolved | Dec 13, 2023 to Apr 10, 2024 |
| Chlorine | Resolved | Apr 1, 2023 to Jun 30, 2023 |
| Chlorine | Resolved | Jan 1, 2023 to Mar 31, 2023 |
| TTHM | Resolved | Jan 1, 2023 to Nov 14, 2023 |
| Total Haloacetic Acids (HAA5) | Resolved | Jan 1, 2023 to Nov 14, 2023 |
| Revised Total Coliform Rule | Resolved | Dec 1, 2022 to Dec 31, 2022 |
| Lead and Copper Rule | Resolved | Oct 1, 2022 to Oct 12, 2023 |
Hardness meter
What does nearby environmental evidence show?
306
PPM as CaCO₃
Very Hard
PPM
306
GPG
17.9
Regional environmental evidence
USGS hardness classification scale
306 PPM
Soft
0–60Moderate
61–120Hard
121–180Very hard
181+
0–60Moderate
61–120Hard
121–180Very hard
181+
Parts per million
306
mg/L as CaCO₃ equivalent
Grains per gallon
17.9
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
1
Nearest site
11.5 mi
Observation range
Oct 26, 2022–Oct 26, 2022
Regional evidence confidence
Low
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: 007N024E06N001S (Well).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
Is 86440 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Mohave Valley median
306 PPM
About the same1 indexed ZIP readings · Range 306–306 PPM
Arizona median
64 PPM
242 PPM higher213 indexed ZIP readings · Range 33–2680 PPM
Evidence-first next steps
Confirm the problem before choosing treatment
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.
Confirm the serving system
ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.
Read the current utility report
A reported action-level record needs context. Check its monitoring period and the utility's current report.
Find an official utility report →Test for the decision you face
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 →Frequently asked
Water questions for Mohave Valley
Is tap water safe in Mohave Valley?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.
Do I need a water softener?+
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.