Kansas City, MO water hardness

Name: Kansas City, MO water hardness as published by KC Water
Creator: KC Water
License: https://www.usa.gov/government-works

KC Water publishes an average hardness of 100 mg/L for its system, on the page cited below. On the USGS scale that is moderately hard water.

KC Water published an average of 100 mg/L. The plotted point is the published average. Classification bands from the USGS Water Science School.

The published figure, exactly as it appears

This is the hardness line transcribed from the source, with nothing added:

The average hardness of KC Water is 100 mg/L (5-6 grains/gallon).
KC Water

Units as published: mg/L, with an approximate grains-per-gallon equivalent given alongside. What kind of figure it is: an average with no range. Retrieved 2026-10-17.

Kansas City 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
Published average	100	5.8	mg/L published, gpg is our conversion
Plotted on the scale above	100	5.8	published average; 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: 100 ÷ 17.1 = 5.8 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	KC Water
Service area as published	KC Water's system. The page does not break the figure down by treatment plant or area.

Provenance of every number on this page

Source document	KC Water, “Water Quality Topics”
Source URL	https://www.kcwater.us/water-quality/water-quality-topics/
Published by	KC Water
Report year	Not stated on the source page
Year note	The page states no year for the hardness average and cites no report.
Retrieved	2026-10-17
Classification bands	USGS Water Science School, retrieved 2026-10-16

Notes the report forces on this page

KC Water prints the grains equivalent as a band, “5-6 grains/gallon”, rather than as a figure. That band is not treated here as a published grains value: the grains figure on this page is our conversion of its 100 mg/L at 17.1, which is 5.8 and falls inside the utility's own band.
The page publishes an average and no sampling range.
The same page prints its own classification bands — soft 0-60 mg/L, moderately hard 61-120, hard 121-180 — which are the USGS bands this site uses.
The page states no year and cites no report.

If you are sizing a softener for Kansas City water

At 5.8 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 Kansas City sits against other verified systems

Soft Soft 0–60

Moderately hard Moderate 61–120

Hard Hard 121–180

Very hard Very hard 181+

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.

Kansas City, MO is the highlighted row. Every other system on this chart has its own page with its own published figure and report date. Grains per gallon are the utility's own figure where it published one, and our conversion at 17.1 mg/L per grain where it did not.

Systems with similar published hardness

Birmingham, AL Birmingham Water Works, 98 mg/L (5.7 gpg)
Washington, DC DC Water, 95 mg/L (5.6 gpg)
Denver, CO Denver Water, 105 mg/L (6.1 gpg)
Austin, TX Austin Water, 93 mg/L (5.4 gpg)

All 44 verified systems How to find hardness in your own utility's report If you are on a well instead