Schofield Barracks Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

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

$0.08

energy & soap waste

Source: See methodology section below · Updated 2026

soft~0–59 mg/LSoft · 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 Schofield Barracks, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Schofield Barracks	Soft Water City	Efficiency Loss
Kettle	8.2 yrs	8.5 yrs	-4%
Washing Machine	11.5 yrs	12 yrs	-4%
Water Heater	14.4 yrs	15 yrs	-4%

Regional Water Comparison

How Schofield Barracks compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Schofield Barracks, Hawaii	≈ 0–59 mg/L	0 ppt	🟢 Soft	groundwater
Wahiawa, Hawaii	≈ 0–60 mg/L	1.5 ppt	🟢 Soft	groundwater
Mililani Town, Hawaii	≈ 0–60 mg/L	1.3 ppt	🟢 Soft	groundwater
Mililani Mauka / Launani Valley, Hawaii	≈ 0–60 mg/L	0.9 ppt	🟢 Soft	groundwater
Waipio, Hawaii	≈ 0–60 mg/L	0.8 ppt	🟢 Soft	groundwater

National Benchmark

How Schofield Barracks compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Schofield Barracks	≈ 0–59 mg/L	🟢 None
USA National Avg	151 mg/L	🟠 Moderate
Scarsdale Top Rated	0.02 mg/L	🟢 None

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What Makes Schofield Barracks's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 255.5 mg/LpH: 7.7

Schofield Barracks Water System, operated by U.S. Army Garrison Hawaii's DPW Environmental Division, serves Schofield Barracks, Wheeler Army Airfield, and Helemano Military Reservation on Oahu. Drinking water is obtained from four deep wells located beneath the Schofield Barracks Water Treatment Plant. Water is chlorinated and fluoridated (target 0.7 ppm) prior to distribution. The utility publishes an annual Consumer Confidence Report (CCR) and can be contacted at 520-687-2207 or 520-687-2162.

The supply draws from Hawaii's volcanic aquifer system, specifically the Waianae and Koolau volcanic formations composed of Quaternary basalts. These young volcanic rocks have minimal mineral content, and the porous basaltic substrate allows rapid infiltration with limited contact time between water and soluble minerals. This geological setting results in naturally soft groundwater, characteristic of the Hawaiian islands' young volcanic geology.

Soft water reduces scale buildup in pipes and appliances, extends equipment lifespan, and improves soap effectiveness, offering significant advantages for military families and facilities. The 2025 CCR confirms all tested contaminants remain below EPA maximum contaminant levels (MCLs), and the system has implemented a Lead Service Line Replacement Plan. The 2025 Annual Water Quality Report (covering 2024 data) grades water quality at A (84/100) — out of 73 contaminants tested, none exceed EPA legal limits, and historical TCE and VOC concerns from a former landfill have been addressed through remedial investigations.

Geology & Source: Schofield Barracks Water Treatment Plant deep wells; Waianae and Koolau volcanic formations — Quaternary basalts with minimal mineral content; porous basaltic substrate limits dissolution, producing naturally soft water

Other Hawaii Water Reports

Wahiawa

≈ 0–60 mg/L

🟢 Soft

Mililani Town

≈ 0–60 mg/L

🟢 Soft

Mililani Mauka / Launani Valley

≈ 0–60 mg/L

🟢 Soft

Waipio

≈ 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 Schofield Barracks's water safe to drink?

Yes. Schofield Barracks's water meets all federal safety standards. The hardness is ≈ 0–59 mg/L (Soft), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in Schofield Barracks?

Schofield Barracks's water is soft at ≈ 0–59 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does Schofield Barracks compare to the USA average?

The USA national average is 151 mg/L. Schofield Barracks (≈ 0–59 mg/L) is 121 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 Schofield Barracks 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.