Arcadia Water Hardness & Quality Report (2026)
Water Hardness
180+ mg/L
Very Hardestimated · not lab-verified
Source
groundwater
pH Level
8.1
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
452.7 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 Arcadia, your appliances are currently losing 45% efficiency due to mineral buildup.
| Appliance | In Arcadia | 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 Arcadia compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Arcadia, California | ≈ 180+ mg/L | 29.2 ppt | 🔴 Very Hard | groundwater |
| Sierra Madre, California | 85.5 mg/L | 0 ppt | 🟡 Moderately Hard | reservoir |
| Monrovia, California | ≈ 120–179 mg/L | 62.5 ppt | 🟠 Hard | groundwater |
| Temple City, California | ≈ 120–179 mg/L | 5.6 ppt | 🟠 Hard | mixed |
| Duarte, California | ≈ 180+ mg/L | 4.6 ppt | 🔴 Very Hard | mixed |
National Benchmark
How Arcadia compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Arcadia | ≈ 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 Arcadia's Water Unique?
Local geology and source profile
The City of Arcadia utility serves 44,738 residents across Arcadia, California, in Los Angeles County. The primary water source is groundwater drawn from local aquifers in the San Gabriel Valley, with wells tapping ancient alluvial deposits beneath the valley floor. No specific treatment plant names are listed in available reports; treatment methods include disinfection with hypochlorite to ensure safe delivery throughout the service area. The utility can be reached at 626-254-2705, 11800 Goldring Road, Arcadia, CA 91006.
The San Gabriel Valley watershed feeds Arcadia's supply, with water percolating through ancient alluvial deposits from the San Gabriel Mountains. Key geological features include limestone and calcium-rich rock formations; calcium carbonate and magnesium sulfate from these mineral-rich layers dissolve into the groundwater over millennia, resulting in highly mineralised water with very high hardness typical of the area's aquifers. Total dissolved solids are high at approximately 430 ppm, reflecting concentrated mineral content from prolonged water-rock contact.
Very hard water promotes significant scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Hard water reacts with soap to form scum, leaving skin dry and itchy, hair brittle, and potentially aggravating eczema. Annual costs from scale damage are estimated at $1,580–$2,700, with energy and detergent savings of approximately $126/year achievable with treatment; a whole-house softener or salt-free conditioner is strongly recommended. The supply meets EPA legal minimums (A-grade compliance) but earns a D-grade for health guidelines; 8 contaminants including arsenic and chromium-6 exceed health guidelines; 57+ contaminants have been tested.
Geology & Source: San Gabriel Valley alluvial aquifer — ancient deposits from San Gabriel Mountains; limestone and calcium-rich rock layers dissolve calcium carbonate and magnesium sulfate into groundwater — very hard supply
Other California Water Reports
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Frequently Asked Questions
Is Arcadia's water safe to drink?
Do I need a water softener in Arcadia?
How does Arcadia compare to the USA average?
Data Sources & Methodology
Water quality data for Arcadia 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.