Fort Worth, TX water hardness
Fort Worth Water publishes a hardness range of 107 to 183 mg/L for its system, in its City of Fort Worth 2021 Water Quality Report. On the USGS scale that is hard water, though the utility's own range crosses more than one class — it spans moderately hard and very hard water from end to end.
The published figure, exactly as it appears
This is the hardness line transcribed from the source, with nothing added:
Total Hardness as CaCO3 ppm 107 to 183 […] Total Hardness in Grains grains/gallon 6 to 11
Fort Worth Water, City of Fort Worth 2021 Water Quality Report
Units as published: ppm and grains/gallon. What kind of figure it is: a range with no average. Retrieved 2026-10-17.
Fort Worth hardness in mg/L and grains per gallon
Water-quality reports use mg/L (identical to ppm). Softener instructions and plumbing specifications use grains per gallon. Both are below. Where a figure is our arithmetic rather than the utility's own number, it says so.
| Figure | mg/L (ppm) | Grains per gallon | Whose number |
|---|---|---|---|
| Low end of published range | 107 | 6 | both published by the utility |
| High end of published range | 183 | 11 | both published by the utility |
| Plotted on the scale above | 145 | 8.5 | midpoint of the published range (no average is published); the gpg here is our conversion at 17.1, so it can differ slightly from a utility’s own rounded gpg figure |
The conversion, both ways: gpg = mg/L ÷ 17.1 and mg/L = gpg × 17.1. Worked for this system: 145 ÷ 17.1 = 8.5 gpg. The converter does °dH and °f as well, and why the factor is 17.1 explains where the number comes from.
What this figure does not tell you
Service area and source water
| Utility | Fort Worth Water |
|---|---|
| Service area as published | The City of Fort Worth's water system. The report does not break hardness down by treatment plant. |
Provenance of every number on this page
| Source document | City of Fort Worth 2021 Water Quality Report |
|---|---|
| Source URL | https://www.fortworthtexas.gov/files/assets/public/v/2/water/documents/water-quality-reports/water-quality-report-2021.pdf |
| Published by | Fort Worth Water |
| Report year | 2021 |
| Year note | The hardness rows are in the report's Secondary Constituents table. The 2021 report is the most recent Fort Worth water quality report that could be fetched on the retrieval date. |
| Retrieved | 2026-10-17 |
| Classification bands | USGS Water Science School, retrieved 2026-10-16 |
Notes the report forces on this page
- The report publishes a range in both units and no average, so the plotted point is the midpoint of the published range rather than a Fort Worth number.
- This is a 2021 report. Later Fort Worth reports exist but none could be fetched on 2026-10-17, so this figure may predate changes in the system. It is the oldest figure on this site after Manchester's and should be re-checked before it is relied on.
- The published range crosses two USGS classes: 107 ppm is moderately hard and 183 ppm is very hard.
If you are sizing a softener for Fort Worth water
At 8.5 gpg, the sizing arithmetic starts from your household's water use, not from the hardness alone. The calculator below is pre-filled with this system's figure and every other input is an editable assumption.
Whether a softener is worth installing at this hardness is a judgement, not arithmetic, and it is not one this site makes for you. Nothing here has been tested by the author.
Where Fort Worth sits against other verified systems
- Portland, OR 9 mg/L 0.5 gpg Soft
- Boston, MA 16 mg/L 1 gpg Soft
- Manchester, NH 17.9 mg/L 1 gpg Soft
- Raleigh, NC 25 mg/L 1.47 gpg Soft
- New York, NY 32 mg/L 2 gpg Soft
- Charlotte, NC 32 mg/L 1.9 gpg Soft
- Memphis, TN 46 mg/L 2.7 gpg Soft
- Anchorage, AK 56 mg/L 3.3 gpg Soft
- Oakland, CA 68.4 mg/L 4 gpg Moderately hard
- Nashville, TN 77.3 mg/L 4.5 gpg Moderately hard
- Sacramento, CA 83 mg/L 4.9 gpg Moderately hard
- Fresno, CA 89.3 mg/L 5.2 gpg Moderately hard
- Saint Paul, MN 90 mg/L 5 gpg Moderately hard
- Austin, TX 93 mg/L 5.4 gpg Moderately hard
- Washington, DC 95 mg/L 5.6 gpg Moderately hard
- Birmingham, AL 98 mg/L 5.7 gpg Moderately hard
- Kansas City, MO 100 mg/L 5.8 gpg Moderately hard
- Denver, CO 105 mg/L 6.1 gpg Moderately hard
- Tulsa, OK 114.5 mg/L 6.7 gpg Moderately hard
- Louisville, KY 115 mg/L 6.7 gpg Moderately hard
- Columbus, OH 120 mg/L 7 gpg Moderately hard
- Cleveland, OH 120 mg/L 7 gpg Moderately hard
- Philadelphia, PA 125 mg/L 7.3 gpg Hard
- Ann Arbor, MI 126 mg/L 7.4 gpg Hard
- Cincinnati, OH 133 mg/L 7.8 gpg Hard
- Milwaukee, WI 137 mg/L 8.01 gpg Hard
- St. Louis, MO 138 mg/L 8.1 gpg Hard
- Fort Worth, TX 145 mg/L 8.5 gpg Hard
- Honolulu, HI 162.5 mg/L 9.5 gpg Hard
- Wichita, KS 170 mg/L 9.9 gpg Hard
- Omaha, NE 170 mg/L 10 gpg Hard
- Los Angeles, CA 192 mg/L 11.2 gpg Very hard
- Lincoln, NE 192 mg/L 11.2 gpg Very hard
- Tampa, FL 220 mg/L 12.9 gpg Very hard
- Phoenix, AZ 237 mg/L 13.9 gpg Very hard
- Mesa, AZ 239.4 mg/L 14 gpg Very hard
- San Diego, CA 276 mg/L 16 gpg Very hard
- Las Vegas, NV 280 mg/L 16 gpg Very hard
- Chandler, AZ 282.2 mg/L 16.5 gpg Very hard
- San Antonio, TX 299.3 mg/L 17.5 gpg Very hard
- Anaheim, CA 300 mg/L 18 gpg Very hard
- Indianapolis, IN 317 mg/L 19 gpg Very hard
- Madison, WI 324.9 mg/L 19 gpg Very hard
- Scottsdale, AZ 352.5 mg/L 20.6 gpg Very hard
mg/L as calcium carbonate. Each classification band is drawn the same width, so the axis is not linear in mg/L.
Systems with similar published hardness
- St. Louis, MO City of St. Louis Water Division, 138 mg/L (8.1 gpg)
- Milwaukee, WI Milwaukee Water Works, 137 mg/L (8 gpg)
- Cincinnati, OH Greater Cincinnati Water Works, 133 mg/L (7.8 gpg)
- Honolulu, HI Honolulu Board of Water Supply, 162.5 mg/L (9.5 gpg)
All 44 verified systems How to find hardness in your own utility's report If you are on a well instead