Hardness
Moderately hard to hard120–155mg/L as CaCO₃ · published range
7.0–9.1 gpg. This older utility guidance is useful context, not a 2025 measurement or a test of your home.
December 2023 utility memoView source
- 1Your water
- 2Your home
- 3Your system
Dallas Water Quality Report: Hardness, Chloramine & More
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Dallas Water Utilities
2025 report; hardness from December 2023 memo
Dallas Water Utilities results apply to that supplier, not every city in Dallas County. Irving, Garland and Grand Prairie have separate distribution-system results.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Chloramine / total chlorine
Average below 4 ppm MRDL2.97ppm
Average total chlorine residual; range 2.75–3.18
2025View source
TTHMs
Below 80 ppb MCL19.7ppb
Highest locational running annual average
2025View source
HAA5
Below 60 ppb MCL15.1ppb
Highest locational running annual average
2025View source
Fluoride
Below 4 ppm MCL0.686ppm
Maximum; average 0.627
2025View source
Lead
Below 15 ppb action level1.1ppb
90th percentile; 0 sites over action level
An individual home may differ.
2024View source
PFAS
Cannot assess high or lowNot quantified here
No compound-specific result used in this summary
Ask DWU for current PFAS monitoring.
2025 reportView source
Nitrate as nitrogen
Below 10 ppm MCL0.802ppm
Maximum; average 0.671
2025View source
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The numbers behind your report
Selected useful results—not a replacement for the utility’s complete report. Older measurements retain their original year.
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| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 120–155 mg/L as CaCO₃ · published range | December 2023 utility memo | Moderately hard to hard7.0–9.1 gpg. This older utility guidance is useful context, not a 2025 measurement or a test of your home. |
| Chloramine / total chlorine | 2.97 ppmAverage total chlorine residual; range 2.75–3.18 | 2025 | Average below 4 ppm MRDL |
| TTHMs | 19.7 ppbHighest locational running annual average | 2025 | Below 80 ppb MCL |
| HAA5 | 15.1 ppbHighest locational running annual average | 2025 | Below 60 ppb MCL |
| Fluoride | 0.686 ppmMaximum; average 0.627 | 2025 | Below 4 ppm MCL |
| Lead | 1.1 ppb90th percentile; 0 sites over action level | 2024 | Below 15 ppb action levelAn individual home may differ. |
| PFAS | Not quantified here No compound-specific result used in this summary | 2025 report | Cannot assess high or lowAsk DWU for current PFAS monitoring. |
| Nitrate as nitrogen | 0.802 ppmMaximum; average 0.671 | 2025 | Below 10 ppm MCL |
| Barium | 0.038 ppmMaximum | 2025 | Below 2 ppm MCL |
| Copper | 0.39 ppm90th percentile | 2024 | Below 1.3 ppm action level |
| Cyanide | 76.8 ppbMaximum | 2025 | Below 200 ppb MCL |
| Atrazine | 0.10 ppbMaximum | 2025 | Below 3 ppb MCL |
| Turbidity | 0.16 NTUHighest single measurement | 2025 | Below 1 NTU single-measurement criterion |
ppm ≈ mg/L; ppb ≈ µg/L; ppt ≈ ng/L in drinking water. Hardness in gpg = mg/L as CaCO₃ ÷ 17.1. ND means not detected at the method’s reporting limit—not zero.
MCL is a maximum contaminant level. MRDL is a disinfectant limit. Lead/copper action levels use system sampling percentiles and are not a safe-tap threshold. TTHM/HAA5 compliance uses locational annual averages.
PFOA/PFOS comparisons use EPA’s 4 ppt values. Historical detections are not a present compliance finding; EPA assesses compliance using running annual averages. Rule implementation is being reviewed. EPA PFAS benchmarks and implementation ↗
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Source water. Dallas uses surface water. Its treatment information identifies chloramine for distribution-system disinfection.
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What this means for your home
Current contaminant results. Clearly dated hardness guidance.
A Dallas postal address and a Dallas Water Utilities account are not always the same thing. Confirm the utility first. This page separates older hardness guidance from the 2025 contaminant results instead of silently presenting every number as current.
A useful local question
Why is Dallas hardness dated differently from the report?
The 2025 water-quality report supplies the contaminant results here. The verified numerical hardness range comes from a December 2023 city memorandum, so it is labeled as older guidance rather than a new 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.
- Dallas Water Utilities ↗2025 report; hardness from December 2023 memo
- Dallas Water Utilities · Hardness source ↗
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources checked October 22, 2026
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