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Yuma County water quality report

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City of Yuma

2025 annual report; individual sample dates shown

City of Yuma, system AZ0414024. Results cover the Main Street and Agua Viva treatment systems and do not automatically apply to Yuma County’s other providers or wells.

Your water at a glance

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

Hardness

Very hard

18–22gpg

City FAQ guidance; approximately 310–380 mg/L

Utility guidance, not a 2025 sample range.

Undated city guidanceView source

Chlorine

Below disinfectant limit

0.57mg/L

Reported result; range 0.02–1.36

4 mg/L MRDL

2025View source

Total trihalomethanes

Near listed limit

79µg/L

Highest running annual average; samples 37–96

80 µg/L MCL

Compliance uses running averages, not the highest individual sample.

2025View source

Haloacetic acids (HAA5)

Below listed limit

17µg/L

Highest running annual average; range 8.7–24

60 µg/L MCL

2025View source

Fluoride

Below listed limit

0.38–0.41mg/L

Agua Viva 0.38; Main Street 0.41

4 mg/L MCL

2025View source

Arsenic

Below listed limit

1.1–1.7µg/L

Main Street 1.1; Agua Viva 1.7

10 µg/L MCL

2025View source

Water hardness by provider

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

UtilityHardnessHardness source
18–22 gpg · very hardUndated city FAQ
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
Hardness18–22 gpgCity FAQ guidance; approximately 310–380 mg/LUndated city guidanceView source ↗Very hardUtility guidance, not a 2025 sample range.
Chlorine0.57 mg/LReported result; range 0.02–1.362025View source ↗Below disinfectant limit4 mg/L MRDL
Total trihalomethanes79 µg/LHighest running annual average; samples 37–962025View source ↗Near listed limitCompliance uses running averages, not the highest individual sample.
Haloacetic acids (HAA5)17 µg/LHighest running annual average; range 8.7–242025View source ↗Below listed limit60 µg/L MCL
Fluoride0.38–0.41 mg/LAgua Viva 0.38; Main Street 0.412025View source ↗Below listed limit4 mg/L MCL
Arsenic1.1–1.7 µg/LMain Street 1.1; Agua Viva 1.72025View source ↗Below listed limit10 µg/L MCL
Chlorine dioxide — Agua Viva1.2 mg/LReported maximum; see dated notice above2025View source ↗Reported exceedance0.8 mg/L MRDL
Nitrate (as nitrogen)0.35–0.42 mg/LAgua Viva 0.35; Main Street 0.422025View source ↗Below listed limit10 mg/L MCL
Sodium110 mg/LBoth treatment plants2025View source ↗No listed standard
Lead1.1 µg/L90th percentile; 0 of 100 samples above the listed action level2024View 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 ↗

Hardness source ↗USGS hardness classification ↗

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Source water. Colorado River water treated at the Main Street and Agua Viva plants; results are identified by plant where appropriate.

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More about your local water

What this means for your home

City of Yuma guidance describes very hard water. The annual report separates results for Main Street and Agua Viva where needed.

City of Yuma and Yuma County are different service areas. Do not apply city treatment-plant results to San Luis, Somerton, a different supplier or a private well. The 2025 report also describes a dated Agua Viva chlorine-dioxide incident; read that notice separately from hardness and everyday treatment goals.

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

A useful local question

How should a City of Yuma home address hard water?

The city’s published 18–22 gpg hardness guidance supports pairing a whole-home filter with a softener for scale. Confirm current incoming hardness and household water demand before sizing. A home system recommendation is not a replacement for utility instructions during an incident.

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.

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