Heavy Metals in Umatilla County Water: Understanding Risks and Treatment Needs

Seasonal and Multi-Year Variation in Heavy Metals Levels

Sampling Dates and Data Range

The U.S. Geological Survey collected groundwater samples from 17 wells across Umatilla County's aquifer between September 2017 and September 2018.

Barium Concentration Range Observed

Concentrations ranged from 0.89 to 58.8 micrograms per liter, with a median of 14.7 micrograms per liter; all results were below federal thresholds for safety.

Stability Over Time

Sampling over one year suggests consistent detection of barium, though levels vary naturally between wells and sampling times within the aquifer.

Additional Considerations for Commercial and Industrial Water Users

Volume of Water Use

Commercial or industrial operations require evaluation of treatment capacity relative to larger daily water demands than typical households.

Process-Specific Water Quality Needs

Some industrial processes may require stricter heavy metals limits than those critical to household use.

Compliance with Industry Standards

Business users should check if local regulations or industry standards impose additional water quality or reporting requirements.

Consequences of Untreated Heavy Metals in Household Water

Potential Accumulation in Household Fixtures

Over years, heavy metals can build up as scale or deposits affecting plumbing and appliances.

Possible Impact on Water Taste and Appearance

Even below safety thresholds, metals like barium may subtly affect water aesthetics, including taste or discoloration.

Importance of Knowing Your Own Water Quality

Without testing your specific well water, it's not possible to know your household's heavy metals levels or risks accurately.

Sources of Heavy Metals in Umatilla County Groundwater

Natural Geology of the Aquifer

Barium enters groundwater through mineral dissolution from geological formations in the Umatilla County aquifer system.

Depth of Sampled Wells

Samples came from wells between 85 and 1150 feet deep, showing depth can influence detected metal levels.

No Known Contamination from Human Activities

The data does not indicate anthropogenic sources contributing to heavy metals in this area's aquifer.

Distinguishing Heavy Metals from Other Common Water Issues

Different from Hardness Minerals

Heavy metals like barium are chemically distinct from calcium or magnesium that cause hardness and require different treatment methods.

Not Related to Iron or Manganese Problems

Barium presence must not be confused with iron or manganese, which have different taste, staining, and treatment considerations.

Difficult to Identify Without Specific Testing

Unlike sediment or cloudiness, heavy metals rarely cause obvious visual water changes on their own.

Role of Plumbing Materials and Age Separate From Source Water

Older Plumbing Can Influence Water Quality

Metal pipes may contribute additional metals independently of source water concentrations.

Plastic and Modern Materials Reduce Plumbing Contributions

Use of PVC or PEX piping can minimize metals leaching from plumbing into household water.

Regular Maintenance and Testing Remain Important

Regardless of plumbing material, routine water testing ensures accurate knowledge of metals levels.

After measuring your household's water demand, consider the Autotrol Heavy Metals Filter, which ships ready to configure and addresses detected heavy metals effectively for typical household usage.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2018-09-20. These figures describe groundwater sampled in this area. They are not a test of any individual private well - only a test of that well can establish its own water.

On record: U.S. Geological Survey sampling of Barium in the aquifer (Umatilla County): 17 results from 17 wells, median 14.7 ug/L, range 0.89-58.8 ug/L; none above any federal threshold