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Cochise County water quality report

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Arizona Water Company — Sierra Vista

2025 annual report; individual sample dates shown

Arizona Water Company Sierra Vista, system AZ0402004. This is separate from Liberty’s Bella Vista systems and other water suppliers serving Sierra Vista addresses.

Your water at a glance

See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.

Hardness

Test needed

Not reported

No numeric hardness in the reviewed annual report. Test incoming water before softener sizing.

2025 annual reportView source

Chlorine

Below disinfectant limit

1.1mg/L

Reported result; range 0.7–1.8

4 mg/L MRDL

2025View source

Arsenic

Below listed limit

ND–1.1µg/L

Sample range

10 µg/L MCL

April–May 2024View source

Fluoride

Below listed limit

0.097–0.19mg/L

Sample range

4 mg/L MCL

May 2024View source

Nitrate (as nitrogen)

Below listed limit

0.1–3.6mg/L

Reported sample result or range

10 mg/L MCL

2025View source

Total trihalomethanes

Below listed limit

8µg/L

Highest running annual average; range 7.8–8

80 µg/L MCL

2025View source

Water hardness by provider

The figures below are provider-specific. They are not a countywide average.

UtilityHardnessHardness source
Not reported — test needed2025 annual report
Not reported — test needed2025 annual report
View Full Water ReportOpen the measured results, dates, comparisons and original utility report.

The numbers behind your report

Selected results with the original sampling dates and measurement basis. Open the utility report for every parameter, notice and footnote.

Open the complete utility report ↗

What was measuredReported amountSample year / source dateHow to read it
HardnessNot reported No numeric hardness in the reviewed annual report. Test incoming water before softener sizing.2025 annual reportView source ↗Test needed
Chlorine1.1 mg/LReported result; range 0.7–1.82025View source ↗Below disinfectant limit4 mg/L MRDL
ArsenicND–1.1 µg/LSample rangeApril–May 2024View source ↗Below listed limit10 µg/L MCL
Fluoride0.097–0.19 mg/LSample rangeMay 2024View source ↗Below listed limit4 mg/L MCL
Nitrate (as nitrogen)0.1–3.6 mg/LReported sample result or range2025View source ↗Below listed limit10 mg/L MCL
Total trihalomethanes8 µg/LHighest running annual average; range 7.8–82025View source ↗Below listed limit80 µg/L MCL
Haloacetic acids (HAA5)1.5 µg/LHighest running annual average; range ND–2.1May 2024 / 2025View source ↗Below listed limit60 µg/L MCL
Sodium14–24 mg/LSample rangeApril–May 2024View source ↗No listed standard
LeadND µg/L90th percentile; no samples above the listed action level2025View source ↗Below listed limit15 µg/L action level
Copper0.14 mg/L90th percentile2025View source ↗Below listed limit1.3 mg/L action level

In drinking water, ppm ≈ mg/L, ppb ≈ µg/L and ppt ≈ ng/L. Calculated hardness in grains per US gallon (gpg) = mg/L as CaCO₃ ÷ 17.118, rounded to one decimal. ND means below the reporting limit, not zero.

MCL is an enforceable contaminant limit; MRDL is a disinfectant limit. A secondary guideline concerns aesthetics. TTHM/HAA5 compliance uses locational running annual averages; read the utility’s notices as well as individual results.

PFAS results are compound-specific. Source monitoring, entry-point samples and tap tests are different. A detected result does not identify every PFAS compound or establish the level at your home. Read the original report for context and current utility notices. EPA PFAS benchmarks and implementation ↗

Hardness source ↗USGS hardness classification ↗

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Source water. Groundwater wells in the Sierra Vista and Sulger areas.

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More about your local water

What this means for your home

Sierra Vista and Bisbee have separate utility reports, sampling dates and treatment priorities.

This guide covers Arizona Water Company’s Sierra Vista and Bisbee systems. Liberty Bella Vista, Douglas, Benson, other utilities and private wells need their own reports. Compare sampling dates carefully: some entries in the 2025 annual reports were tested in earlier years.

Filter vs. softener: what each doesPlan installation with your plumber

A useful local question

Which Cochise County report should I use?

Use the supplier and system name on your water bill. Arizona Water Company Sierra Vista and Bisbee results are shown separately here; a Sierra Vista address alone does not identify the provider. If your supplier is not listed, use its official report and test hardness before softener sizing.

Sources and methodology

We keep each utility’s results separate, show the reported sample year, and distinguish averages, maxima and tap-sampling percentiles. Hardness classifications use USGS ranges. Missing data stays unknown.

Different name on your water bill?

The systems covered here publish separate reports. Use the official links to confirm your utility and system. If yours is not listed, choose Other / not sure.

Sources reviewed November 8, 2026. Individual sample years are shown with each result.

Your water → your home → your system

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Choose the system size, keep useful existing equipment, and review your filtration goals.

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