Keystone Water Hardness & Quality Report (2026)
Water Hardness
15.8 grains per gallon
Source
groundwater
pH Level
8.5
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
848 mg/L
Est. Daily Cost
$0.72
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 Keystone, your appliances are currently losing 36% efficiency due to mineral buildup.
| Appliance | In Keystone | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 5.4 yrs | 8.5 yrs | -36% |
| Washing Machine | 7.7 yrs | 12 yrs | -36% |
| Water Heater | 9.6 yrs | 15 yrs | -36% |
Regional Water Comparison
How Keystone compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Keystone, Florida | 271 mg/L | 11.1 ppt | 🔴 Very Hard | groundwater |
| Trinity, Florida | ≈ 180+ mg/L | 4.9 ppt | 🔴 Very Hard | groundwater |
| East Lake, Florida | 104.5 mg/L | 5.9 ppt | 🟡 Moderately Hard | groundwater |
| Citrus Park, Florida | ≈ 120–179 mg/L | 5 ppt | 🟠 Hard | groundwater |
| Westchase, Florida | ≈ 180+ mg/L | 7.6 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Keystone compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Keystone | 271 mg/L | 🔴 High |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Keystone's Water Unique?
Local geology and source profile
Clay County Utility Authority serves Keystone Heights and surrounding areas in Clay County, Florida. The utility draws exclusively from the Floridan aquifer system, a major regional groundwater resource underlying north-central Florida. Treatment facilities process the groundwater before distribution to residential and commercial customers throughout the service area. Keystone Heights is situated within the St. Johns River watershed. The Clay County Utility Authority publishes an annual Consumer Confidence Report detailing water quality parameters, treatment processes, and compliance with EPA Safe Drinking Water Act standards. Residents may reach the authority at 904-272-5999.
The water supply originates from the Floridan aquifer, composed primarily of Paleocene to Eocene limestone and dolomite formations. This karst geology is characteristic of Florida's peninsula and naturally produces mineralized groundwater as water percolates through carbonate rock layers containing calcium and magnesium compounds. The limestone geology throughout Clay County contributes dissolved minerals, resulting in hard to very hard groundwater characteristics typical of north-central Florida's karst landscape.
Hard to very hard water in Keystone Heights causes scale buildup on fixtures, spotting on dishes, and reduced soap effectiveness. Water heaters, dishwashers, and plumbing are most vulnerable to mineral deposits. Water softening systems are commonly recommended for households and businesses in this region to mitigate mineral accumulation and extend appliance lifespan. Specific pH, lead/copper, and contaminant data are available through the Clay County Utility Authority's official water quality documentation and annual Consumer Confidence Report.
Geology & Source: Floridan aquifer system; Paleocene to Eocene limestone and dolomite formations in Clay County karst — carbonate rock dissolves calcium and magnesium, producing naturally hard to very hard groundwater
Other Florida Water Reports
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Frequently Asked Questions
Is Keystone's water safe to drink?
Do I need a water softener in Keystone?
How does Keystone compare to the USA average?
Data Sources & Methodology
Water quality data for Keystone 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.