Ojus Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
groundwater
pH Level
7.5
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
217.3 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 Ojus, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Ojus | 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 Ojus compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Ojus, Florida | ≈ 120–179 mg/L | 5.5 ppt | 🟠 Hard | groundwater |
| Aventura, Florida | ≈ 120–179 mg/L | 6.4 ppt | 🟠 Hard | groundwater |
| North Miami Beach, Florida | ≈ 180+ mg/L | 376.5 ppt | 🔴 Very Hard | groundwater |
| Sunny Isles Beach, Florida | ≈ 180+ mg/L | 5 ppt | 🔴 Very Hard | groundwater |
| Ives Estates, Florida | ≈ 120–179 mg/L | 8.2 ppt | 🟠 Hard | groundwater |
National Benchmark
How Ojus compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Ojus | ≈ 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 Ojus's Water Unique?
Local geology and source profile
Ojus, an unincorporated community in Miami-Dade County, Florida, receives municipal water from the Miami-Dade Water and Sewer Department (WASD), sourcing supply entirely from the Biscayne Aquifer via wellfields including the Hialeah, Northwest, and South Dade facilities. Key treatment plants — the Alexander Orr Jr. Water Treatment Plant and the John E. Preston Water Treatment Plant — process the groundwater, serving over 2.4 million residents across Miami-Dade County. Treatment includes aeration for volatiles, filtration, chloramination for disinfection, fluoridation, and corrosion control via pH adjustment and orthophosphate dosing; no PFAS exceedances appear in recent Consumer Confidence Reports.
The Biscayne Aquifer's recharge area encompasses the Everglades watershed and urban runoff zones in southeast Florida. Water infiltrates through sandy soils into the karstic Miami Limestone (calcareous oolite) and overlying Pamlico Sand, forming a dynamic freshwater lens overlying saltwater intrusion zones. This Pleistocene carbonate platform geology, shaped by sea-level fluctuations, dissolves readily — yielding a moderately mineralised supply influenced by the limestone's high calcium carbonate content and minor magnesium from associated formations, contributing to elevated dissolved solids typical of this karstic system.
Moderately hard water slightly increases soap consumption and leaves minor spots on glassware and fixtures. Dishwashers, washing machines, and water heaters are most affected, with scale gradually reducing appliance efficiency over time. Vinegar rinses for faucets and coffee makers, along with scale-inhibiting filters and periodic descaling of heaters, are recommended maintenance steps. A water softener is advisable for laundries or households noticing reduced lather and buildup. Miami-Dade WASD reports pH typically 7.5–8.2; disinfection byproducts (TTHMs, HAA5s) are managed below MCLs via chloramination, and lead and copper rules are met through corrosion control.
Geology & Source: Miami-Dade County Biscayne Aquifer — Pleistocene Miami Limestone and Fort Thompson Formation karstic carbonates; rapid calcium carbonate dissolution during rainwater infiltration produces mineralised, hard water
Other Florida Water Reports
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Frequently Asked Questions
Is Ojus's water safe to drink?
Do I need a water softener in Ojus?
How does Ojus compare to the USA average?
Data Sources & Methodology
Water quality data for Ojus 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.