Manhattan Water Hardness & Quality Report (2026)
Water Hardness
180+ mg/L
Very Hardestimated · not lab-verified
Source
groundwater
pH Level
8.3
neutral = 7.0
Lead
0.001 mg/L
✓ Below action level
TDS
474 mg/L
Est. Daily Cost
$0.91
energy & soap waste
Source: See methodology section below · Updated 2026
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 Manhattan, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Manhattan | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.7 yrs | 8.5 yrs | -45% |
| Washing Machine | 6.6 yrs | 12 yrs | -45% |
| Water Heater | 8.3 yrs | 15 yrs | -45% |
Regional Water Comparison
How Manhattan compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Manhattan, Kansas | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
| Junction City, Kansas | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | groundwater |
| Emporia, Kansas | ≈ 120–179 mg/L | 0 ppt | 🟠 Hard | reservoir |
| Topeka, Kansas | 154 mg/L | 5.1 ppt | 🟠 Hard | river |
| Salina, Kansas | ≈ 120–179 mg/L | 75 ppt | 🟠 Hard | reservoir |
National Benchmark
How Manhattan compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Manhattan | ≈ 180+ mg/L | 🔴 High |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Manhattan's Water Unique?
Local geology and source profile
The City of Manhattan, Kansas, operates a municipal water utility serving 54,763 people across Riley County. The water supply consists of 19–20 public groundwater wells situated near the confluence of the Big Blue and Kansas rivers. The utility maintains over 280 miles of water mains, valves, pressure-reducing valves, fire hydrants, and water meters. Chloramination serves as the primary disinfectant. The main office is located at 1101 Poyntz Avenue, Manhattan, KS 66502, reachable at 785-587-4559.
Manhattan's groundwater originates from Quaternary alluvial and glacial aquifer deposits overlying Paleozoic bedrock in the central Great Plains. The geology is dominated by limestone and dolomite strata from the Pennsylvanian and Permian periods, which dissolve readily in percolating water to release calcium and magnesium carbonates. The Big Blue River watershed, which recharges local groundwater, flows through similar carbonate-rich terrain, reinforcing the very hard water character typical of the region.
Very hard water in Manhattan creates significant scale accumulation in water heaters, dishwashers, washing machines, and plumbing fixtures, rapidly reducing appliance efficiency and lifespan. Soap and detergent consumption increases substantially as hardness minerals interfere with lathering. Regular descaling of kettles, coffee makers, and showerheads is necessary; a whole-house water softener is strongly recommended. Drinking water meets all EPA, KDHE, and Clean Water Act standards with no violations recorded in 2022. Third-party testing has detected arsenic above EPA health guidelines, occurring naturally in soil and bedrock; solid activated carbon filtration is employed to address contaminants including lead.
Geology & Source: Riley County; Quaternary alluvial/glacial aquifer over Pennsylvanian and Permian limestone/dolomite bedrock near Big Blue and Kansas rivers confluence — high calcium/magnesium carbonate dissolution yields very hard water
Other Kansas Water Reports
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Frequently Asked Questions
Is Manhattan's water safe to drink?
Do I need a water softener in Manhattan?
How does Manhattan compare to the USA average?
Data Sources & Methodology
Water quality data for Manhattan is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
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.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
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.
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.
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.
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.