Mount Pleasant Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
river
pH Level
7.8
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
242.4 mg/L
Est. Daily Cost
$0.40
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 Mount Pleasant, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Mount Pleasant | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Mount Pleasant compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mount Pleasant, District of Columbia | ≈ 120–179 mg/L | 7.2 ppt | 🟠 Hard | river |
| Adams Morgan, District of Columbia | 126 mg/L | 8.1 ppt | 🟠 Hard | river |
| Central 14th Street / Spring Road, District of Columbia | ≈ 120–179 mg/L | 7.5 ppt | 🟠 Hard | river |
| Pleasant Plains, District of Columbia | 120.5 mg/L | 8.1 ppt | 🟠 Hard | river |
| Columbia Heights, District of Columbia | ≈ 120–179 mg/L | 9.7 ppt | 🟠 Hard | river |
National Benchmark
How Mount Pleasant compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mount Pleasant | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Mount Pleasant's Water Unique?
Local geology and source profile
Mount Pleasant Water System serves the Town of Mount Pleasant, South Carolina, drawing its supply from natural springs located south and southeast of the municipality. The system sources groundwater under the influence of surface water and supplements with a small amount from the Columbia water systems. The utility operates treatment facilities designed to reduce potential contaminants and ensure compliance with EPA health standards. The system conducts testing for over 80 potential drinking water contaminants to safeguard the community's water supply.
The water supply originates from the Coastal Plain aquifer system of South Carolina, characterized by unconsolidated sediments and limestone formations typical of the Low Country geology. This hydrogeological setting produces a moderately mineralized water supply, with local limestone and sedimentary formations contributing dissolved minerals—particularly calcium and magnesium compounds—that define the water's hardness character and distinguish it from harder inland supplies.
At moderately hard levels, Mount Pleasant residents may notice minor scale buildup on fixtures and appliances, particularly in warmer months. Dishwashers may show slight spotting on glassware, and water heaters may accumulate minor sediment over time. A water softener is recommended for households concerned with appliance longevity and cleaning efficiency. The Mount Pleasant Water System has detected 17 contaminants, all at safe levels compliant with EPA standards; lead in drinking water primarily originates from service lines and home plumbing rather than from the source water itself.
Geology & Source: Coastal Plain aquifer system — South Carolina; unconsolidated sediments and limestone formations of the Low Country; calcium and magnesium from limestone and sedimentary units contribute moderate mineral content
Other District of Columbia Water Reports
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Frequently Asked Questions
Is Mount Pleasant's water safe to drink?
Do I need a water softener in Mount Pleasant?
How does Mount Pleasant compare to the USA average?
Data Sources & Methodology
Water quality data for Mount Pleasant 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.