How does Merriam's water compare to the national average?

The USA national average is 151 mg/L. Merriam (≈ 0–59 mg/L) is 121 mg/L softer than average.

Merriam Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

groundwater

pH Level

7.9

neutral = 7.0

Lead

0.002 mg/L

✓ Below action level

TDS

432.9 mg/L

Est. Daily Cost

$0.08

energy & soap waste

Source: See methodology section below · Updated 2026

soft~0–59 mg/LSoft · est.

0–60

mg/L

Soft

61–120

mg/L

Moderately Hard

121–180

mg/L

Hard

180+

mg/L

Very Hard

Appliance Damage Report

In Merriam, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Merriam	Soft Water City	Efficiency Loss
Kettle	8.2 yrs	8.5 yrs	-4%
Washing Machine	11.5 yrs	12 yrs	-4%
Water Heater	14.4 yrs	15 yrs	-4%

Regional Water Comparison

How Merriam compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Merriam, Kansas	≈ 0–59 mg/L	2.9 ppt	🟢 Soft	groundwater
Shawnee, Kansas	≈ 180+ mg/L	4.8 ppt	🔴 Very Hard	groundwater
Overland Park, Kansas	≈ 120–179 mg/L	5.1 ppt	🟠 Hard	river
Prairie Village, Kansas	≈ 120–179 mg/L	2.5 ppt	🟠 Hard	groundwater
Lenexa, Kansas	≈ 120–179 mg/L	5.2 ppt	🟠 Hard	groundwater

National Benchmark

How Merriam compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Merriam	≈ 0–59 mg/L	🟢 None
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Merriam's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 432.9 mg/LpH: 7.9

Merriam, Kansas, gets its drinking water through interconnected systems in the Kansas City metro area, primarily from Johnson County Wastewater or WaterOne. The main sources are the Kansas River and Missouri River, with treatment occurring at facilities such as the Olathe or Lenexa plants. This supply serves residential, commercial, and industrial users across the approximately 4 square miles of Merriam.

The watershed covers the Kansas River basin, flowing from the High Plains into the Missouri River confluence. Tributaries here are shaped by glacial outwash and loess deposits over Paleozoic and Mesozoic bedrock. Key formations include Permian shales and limestones of the Chase Group, which recharge shallow alluvial aquifers along river valleys. This geology typically imparts a hard water character through the dissolution of carbonate minerals, though surface water dilution and watershed management help moderate the mineral load, resulting in moderately mineralized output after treatment.

At soft levels, scale buildup is minimal, sparing coffee makers, dishwashers, and water heaters from rapid calcification, with little need for frequent descaling or vinegar flushes. Laundry detergents perform efficiently without excess use, and skin feels less dry post-shower. A water softener is typically not recommended, as the low mineral content avoids soap scum and spotting on glassware; instead, focus on basic filtration for chlorine taste if desired.

Geology & Source: Kansas River watershed and underlying aquifers; limestone and dolomite layers yield hard water but surface water dominance and treatment result in softer character

Other Kansas Water Reports

Shawnee

≈ 180+ mg/L

🔴 Very Hard

Overland Park

≈ 120–179 mg/L

🟠 Hard

Prairie Village

≈ 120–179 mg/L

🟠 Hard

Lenexa

≈ 120–179 mg/L

🟠 Hard

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Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.

All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Merriam's water safe to drink?

Yes. Merriam's water meets all federal safety standards. The hardness is ≈ 0–59 mg/L (Soft), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Merriam?

Merriam's water is soft at ≈ 0–59 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Merriam compare to the USA average?

The USA national average is 151 mg/L. Merriam (≈ 0–59 mg/L) is 121 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for Merriam is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

Water Hardness

Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

TDS — Total Dissolved Solids

Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.

Measured

PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances

EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.

Modelled

Lead

Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.

Calculated

Appliance Lifespan

Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.