Hardness
Test neededNot reported
No numeric hardness in the reviewed annual report. Test incoming water before softener sizing.
2025 annual reportView source
- 1Your water
- 2Your home
- 3Your system
Coconino County water quality report
Showing utility report
City of Flagstaff
2025 annual report; individual sample dates shown
City of Flagstaff municipal system. Water sources and blends vary; these measurements do not describe Page, Williams, tribal systems or private wells across Coconino County.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Chlorine
Below disinfectant limit0.69mg/L
Reported result; range ND–1.44
4 mg/L MRDL
2025View source
Arsenic
Below listed limit6.9µg/L
Highest reported result
10 µg/L MCL
2025View source
Fluoride
Below listed limit0.072mg/L
Reported result
4 mg/L MCL
2025View source
Total trihalomethanes
Below listed limit26µg/L
Highest running annual average; range ND–56
80 µg/L MCL
2025View source
Haloacetic acids (HAA5)
Below listed limit12µg/L
Highest running annual average; range ND–24
60 µg/L MCL
2025View source
Your provider needs its own report.
Continue with your home details for general filtration guidance. We will not use another utility’s numbers as your result.
Find My Water System →Private well? Start with a current water test.
A city report cannot establish a well’s water quality. Well-water treatment depends on your test results and site conditions.
Explore well-water systems →Water hardness by provider
The figures below are provider-specific. They are not a countywide average.
| Utility | Hardness | Hardness source |
|---|---|---|
| Not reported — test needed | 2025 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.
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| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | Not reported No numeric hardness in the reviewed annual report. Test incoming water before softener sizing. | 2025 annual reportView source ↗ | Test needed |
| Chlorine | 0.69 mg/LReported result; range ND–1.44 | 2025View source ↗ | Below disinfectant limit4 mg/L MRDL |
| Arsenic | 6.9 µg/LHighest reported result | 2025View source ↗ | Below listed limit10 µg/L MCL |
| Fluoride | 0.072 mg/LReported result | 2025View source ↗ | Below listed limit4 mg/L MCL |
| Total trihalomethanes | 26 µg/LHighest running annual average; range ND–56 | 2025View source ↗ | Below listed limit80 µg/L MCL |
| Haloacetic acids (HAA5) | 12 µg/LHighest running annual average; range ND–24 | 2025View source ↗ | Below listed limit60 µg/L MCL |
| Nitrate (as nitrogen) | 2.0 mg/LHighest result; range 0.087–2.0 | 2025View source ↗ | Below listed limit10 mg/L MCL |
| Barium | 0.160 mg/LReported result | 2025View source ↗ | Below listed limit2 mg/L MCL |
| Sodium | 6.8 mg/LHighest result; range 3.2–6.8 | 2025View source ↗ | No listed standard |
| Lead | 3.6 µg/L90th percentile; no samples above the listed action level | 2023View source ↗ | Below listed limit15 µg/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 ↗
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Choose the system size, keep useful existing equipment, and review your filtration goals.
Source water. A changing blend of Upper Lake Mary surface water, seasonal Inner Basin water and deep groundwater wells.
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More about your local water
What this means for your home
Flagstaff uses both surface water and groundwater. Its source mix can change, so use the system on your bill.
Coconino County covers many independent municipal, tribal and smaller drinking-water systems. This guide starts with the City of Flagstaff. Flagstaff measurements do not describe every address in the county, and the reviewed report does not provide numeric hardness for softener settings.
A useful local question
Is Flagstaff water hard enough for a softener?
The reviewed 2025 Flagstaff annual report does not list hardness. We suggest filtration and a softener where scale is a concern, with an incoming-water hardness test before final sizing and settings. Do not substitute a statewide or county average for a home measurement.
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.
- City of Flagstaff ↗2025 annual report; individual sample dates shown
- USGS hardness classification
- EPA PFAS benchmarks and implementation
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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