Schofield Barracks Water Hardness & Quality Report (2026)
Water Hardness
4.5 grains per gallon
Source
groundwater
pH Level
7.7
neutral = 7.0
Lead
0.009 mg/L
✓ Below action level
TDS
255.5 mg/L
Est. Daily Cost
$0.20
energy & soap waste
Source: USGS Water Quality Portal · 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 Schofield Barracks, your appliances are currently losing 10% efficiency due to mineral buildup.
| Appliance | In Schofield Barracks | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.1 yrs | 8.5 yrs | -16% |
| Washing Machine | 10.8 yrs | 12 yrs | -10% |
| Water Heater | 12.5 yrs | 15 yrs | -17% |
Regional Water Comparison
How Schofield Barracks compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Schofield Barracks, Hawaii | 76.5 mg/L | 1.5 ppt | 🟡 Moderately Hard | groundwater |
| Wahiawa, Hawaii | 77.5 mg/L | 1.5 ppt | 🟡 Moderately Hard | groundwater |
| Mililani Town, Hawaii | 67.5 mg/L | 1.3 ppt | 🟡 Moderately Hard | groundwater |
| Mililani Mauka / Launani Valley, Hawaii | 35 mg/L | 0.9 ppt | 🟢 Soft | groundwater |
| Royal Kunia, Hawaii | 76.5 mg/L | 1.5 ppt | 🟡 Moderately Hard | groundwater |
National Benchmark
How Schofield Barracks compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Schofield Barracks | 76.5 mg/L | 🟡 Low |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Schofield Barracks's Water Unique?
Local geology and source profile
Schofield Barracks, Hawaii, in Honolulu County — the US Army's largest garrison in the Pacific, adjacent to Wahiawa and Wheeler Army Airfield in the central Oahu plateau — receives its water from the US Army Directorate of Public Works and the Oahu Board of Water Supply, drawing from the Schofield-Central Oahu Aquifer (central Oahu plateau, Honolulu County).
The moderately soft 76.5 mg/L hardness and elevated TDS of 255.5 mg/L — notable because the TDS is high relative to the hardness (TDS/hardness ratio ≈ 3.3) — reflect the central Oahu basalt aquifer's mineral character. The Central Oahu Aquifer is developed in Pliocene Waianae Basalt (insoluble tholeiitic basalt — very low calcium and magnesium), Pleistocene Kolekole Basalt (insoluble), and perched water zones with minor calcareous influence. The elevated TDS relative to hardness reflects basaltic mineral ions (silica, sodium, potassium) rather than calcium-magnesium carbonate.
At 76.5 mg/L, Schofield Barracks' water is moderately soft — light scale forms slowly in appliances, dishwashers remain efficient, and bathroom fixtures need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 1.5 ppt is very low — despite the military installation's historic AFFF use (Schofield Barracks experienced drinking water PFAS issues in 2014-2016 from the Red Hill fuel facility and military training areas), post-remediation water supply has been restored to very low PFAS levels.
Geology & Source: Schofield Barracks in Honolulu County draws from the US Army Directorate of Public Works on the Schofield-Central Oahu Aquifer (Honolulu County, central Oahu) — the Central Oahu Aquifer is developed in Pliocene Waianae Basalt and Pleistocene Kolekole Basalt (insoluble) with calcareous perched zones — Hawaii Honolulu County central Oahu volcanic basalt aquifer produces moderately soft water at 76.5 mg/L with TDS 255.5 mg/L.