How does Forest Grove's water compare to the national average?

The USA national average is 151 mg/L. Forest Grove (≈ 0–59 mg/L) is 121 mg/L softer than average.

Forest Grove Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

reservoir

pH Level

7.4

neutral = 7.0

Lead

0.008 mg/L

✓ Below action level

TDS

62 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 Forest Grove, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In Forest Grove	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 Forest Grove compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Forest Grove, Oregon	≈ 0–59 mg/L	0 ppt	🟢 Soft	reservoir
Cornelius, Oregon	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Hillsboro, Oregon	≈ 120–179 mg/L	0 ppt	🟠 Hard	reservoir
Aloha, Oregon	≈ 120–179 mg/L	2.1 ppt	🟠 Hard	groundwater
Bethany, Oregon	≈ 0–60 mg/L	2.2 ppt	🟢 Soft	reservoir

National Benchmark

How Forest Grove compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ Forest Grove	≈ 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 Forest Grove's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 62 mg/LpH: 7.4

City of Forest Grove Water Division provides drinking water to approximately 25,000 residents in Forest Grove and portions of nearby areas within Washington County, Oregon. The utility sources its supply from multiple municipal wells tapping the Tualatin Valley Groundwater Aquifer. Water is treated at the city's Water Treatment Plant before distribution through the system. The Forest Grove Water Resource Recovery Facility handles wastewater separately, serving Forest Grove, Cornelius, and Gaston via Clean Water Services.

The watershed encompasses the Tualatin River Basin, with groundwater recharged by precipitation from the adjacent Coast Range and Chehalem Mountains. The aquifer consists of Quaternary alluvial deposits in the Willamette Valley, overlying volcanic basalts and marine sediments from the Tyee Formation (Eocene), with recharge influenced by Columbia River Basalt Group basalt flows (Miocene). Minimal contact with calcium and magnesium-bearing limestones or dolomites in the sandy-gravelly strata results in characteristically soft water with low dissolved solids.

Soft water produces minimal scale buildup, protecting appliances like water heaters, dishwashers, and washing machines from mineral deposits. Soap lathers easily, reducing detergent use, but soft water may present minor corrosion risks in older plumbing. Routine maintenance involves checking for leaks rather than descaling; a softener is not recommended and could overly strip beneficial minerals. The 2025 City of Forest Grove Water Quality Report confirms compliance with federal and state standards, with no violations for lead or copper and no PFAS detections above limits; all contaminants are below MCLs per EPA SDWIS data, with treatment including chloramination disinfection and corrosion control.

Geology & Source: Tualatin Valley Groundwater Aquifer, Willamette Valley; Quaternary alluvium and Troutdale Formation overlying Columbia River Basalt Group — minimal carbonate minerals in sandy-gravelly strata produce characteristically soft water

Other Oregon Water Reports

Cornelius

≈ 120–179 mg/L

🟠 Hard

Hillsboro

≈ 120–179 mg/L

🟠 Hard

Aloha

≈ 120–179 mg/L

🟠 Hard

Bethany

≈ 0–60 mg/L

🟢 Soft

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All reports are reviewed by our team. Thank you for supporting data quality!

Frequently Asked Questions

Is Forest Grove's water safe to drink?

Yes. Forest Grove'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 Forest Grove?

Forest Grove'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 Forest Grove compare to the USA average?

The USA national average is 151 mg/L. Forest Grove (≈ 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 Forest Grove 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.