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

The USA national average is 151 mg/L. Sumter (≈ 120–179 mg/L) is 1 mg/L softer than average.

Sumter Water Hardness & Quality Report (2026)

Water Hardness

hard

~120–179 mg/L

Hard

estimated · not lab-verified

Source

groundwater

pH Level

6.4

neutral = 7.0

Lead

0.002 mg/L

✓ Below action level

TDS

36 mg/L

Est. Daily Cost

$0.40

energy & soap waste

Source: See methodology section below · Updated 2026

hard~120–179 mg/LHard · 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 Sumter, your appliances are currently losing 20% efficiency due to mineral buildup.

Appliance	In Sumter	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 Sumter compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Sumter, South Carolina	≈ 120–179 mg/L	0 ppt	🟠 Hard	groundwater
Dentsville, South Carolina	≈ 120–179 mg/L	8 ppt	🟠 Hard	reservoir
Florence, South Carolina	≈ 0–60 mg/L	75.1 ppt	🟢 Soft	reservoir
Forest Acres, South Carolina	≈ 120–179 mg/L	7.4 ppt	🟠 Hard	reservoir
Orangeburg, South Carolina	≈ 0–60 mg/L	16.2 ppt	🟢 Soft	reservoir

National Benchmark

How Sumter compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Sumter	≈ 120–179 mg/L	🟠 Moderate
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

Bring Scarsdale-quality water to your Sumter home

Shop water softeners on Amazon.com →

Shop Now

What Makes Sumter's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 36 mg/LpH: 6.4

The City of Sumter Public Works Department operates the drinking water utility serving approximately 53,070 residents in Sumter, South Carolina, primarily within Sumter County. Water is sourced from 23 deep wells tapping the Black Creek and Middendorf aquifers, treated at six water treatment plants around the city. The utility uses conventional treatment methods including chlorination for disinfection. Contact the utility at 803-774-7036 or PO Box 1449, Sumter, SC 29151. The city relies exclusively on these groundwater systems; nearby South Sumter Utilities draws from the Floridan Aquifer, but the City of Sumter relies on the distinct Black Creek and Middendorf systems.

The groundwater originates from the Black Creek and Middendorf aquifers within the coastal plain sediments of South Carolina. The Black Creek Aquifer consists of unconsolidated sands and clays of Late Cretaceous age, while the Middendorf Aquifer is formed in the Middendorf Formation, featuring quartz sands, clays, and minor gravels also from the Late Cretaceous period. These confined aquifers shape water chemistry through mineral dissolution, imparting a moderately mineralised profile typical of sedimentary aquifer waters; the soft, unconsolidated nature of these formations allows for moderate hardness ion concentration without the extremes seen in limestone-dominated karst systems.

At moderately hard levels, scale buildup occurs noticeably in appliances such as water heaters, dishwashers, and coffee makers, reducing efficiency over time. Faucet aerators and showerheads may clog, leading to reduced flow. Regular maintenance includes monthly vinegar descaling for visible fixtures and annual inspections of heating elements. A water softener is recommended for households to extend appliance life and improve soap efficiency. Water quality meets EPA health guidelines overall; treatment involves chlorination with operators testing iron, pH, and chlorine three times daily at plants, plus continuous automated monitoring of chlorine and pH.

Geology & Source: Southeastern Coastal Plain — Black Creek Aquifer (Late Cretaceous unconsolidated sands and clays) and Middendorf Aquifer (Middendorf Formation quartz sands, clays, gravels); prolonged contact with calcium and magnesium-bearing sediments produces

Other South Carolina Water Reports

Dentsville

≈ 120–179 mg/L

🟠 Hard

Florence

≈ 0–60 mg/L

🟢 Soft

Forest Acres

≈ 120–179 mg/L

🟠 Hard

Orangeburg

≈ 0–60 mg/L

🟢 Soft

Report an Issue

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 Sumter's water safe to drink?

Yes. Sumter's water meets all federal safety standards. The hardness is ≈ 120–179 mg/L (Hard), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Sumter?

At ≈ 120–179 mg/L (Hard), Sumter's water will cause significant limescale on kettles, washing machines, and water heaters. A water softener or descaler is strongly recommended to extend appliance lifespan and reduce energy bills by up to 20%.

How does Sumter compare to the USA average?

The USA national average is 151 mg/L. Sumter (≈ 120–179 mg/L) is 1 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 Sumter 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.