Pendleton Water Hardness & Quality Report (2026)
Water Hardness
5.8 grains per gallon
Source
groundwater
pH Level
8.1
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
199 mg/L
Est. Daily Cost
$0.27
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 Pendleton, your appliances are currently losing 13% efficiency due to mineral buildup.
| Appliance | In Pendleton | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.4 yrs | 8.5 yrs | -13% |
| Washing Machine | 10.4 yrs | 12 yrs | -13% |
| Water Heater | 13.1 yrs | 15 yrs | -13% |
Regional Water Comparison
How Pendleton compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Pendleton, Oregon | 99.5 mg/L | 4.8 ppt | 🟡 Moderately Hard | groundwater |
| Hermiston, Oregon | 45.5 mg/L | 115.1 ppt | 🟢 Soft | reservoir |
| Walla Walla, Washington | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | reservoir |
| Kennewick, Washington | ≈ 120–179 mg/L | 162.6 ppt | 🟠 Hard | reservoir |
| Pasco, Washington | ≈ 0–60 mg/L | 0 ppt | 🟢 Soft | reservoir |
National Benchmark
How Pendleton compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Pendleton | 99.5 mg/L | 🟡 Low |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Pendleton's Water Unique?
Local geology and source profile
The City of Pendleton, Oregon, operates a municipal water utility serving the city and surrounding areas in Umatilla County in northeastern Oregon. The utility sources water exclusively from surface water, drawing from the Grande Ronde River watershed. The Public Works Department manages water treatment and distribution; the utility can be reached at 541-966-0202 or 541-966-0249. A 2024 Water Quality Report has been published and is available to the public, though a noted correction exists on page 8 of that report, covering compliance with Safe Drinking Water Act standards, treatment processes, and detected contaminants.
Pendleton's supply originates in the Grande Ronde River system, which drains the Blue Mountains of northeastern Oregon. The watershed geology is characterized by Miocene-age basaltic lava flows interspersed with sedimentary formations typical of the Columbia River Basalt Group and associated volcanic provinces. This volcanic and sedimentary terrain produces surface water with moderate mineral content influenced by volcanic rock weathering and regional groundwater contributions. The specific hardness character of Pendleton's supply was not quantified in official utility publications.
Because hardness data was not officially quantified in available reports, residents experiencing scale buildup on fixtures, reduced soap lather, or appliance maintenance issues should consult the utility directly or request a detailed water quality analysis. The utility's annual Consumer Confidence Report (CCR) is the authoritative source for mineral content and treatment data. The 2024 Water Quality Report indicates contaminants above EPA health-based guidelines (MCLGs) have been reported; residents are encouraged to contact the Public Works Department for current pH, lead/copper testing results, and other water quality parameters of concern.
Geology & Source: Grande Ronde River watershed, Blue Mountains province — Miocene-age basaltic lava flows and associated sedimentary formations; volcanic rock weathering contributes moderate mineralization; no specific aquifer name disclosed
Other Oregon Water Reports
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Frequently Asked Questions
Is Pendleton's water safe to drink?
Do I need a water softener in Pendleton?
How does Pendleton compare to the USA average?
Data Sources & Methodology
Water quality data for Pendleton 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.