Understanding Perchlorate in Thurston County Water: Facts About Local Groundwater Levels

Perchlorate is Often Mixed Up with Other Water Contaminants, But It Has Distinct Characteristics

In Thurston County, the groundwater supplying the public water system that serves over 100,000 residents originates from local aquifers filtered naturally through soil and rock layers. According to the EPA's monitoring from 2001 to 2005 for the Lacey Water Department system, perchlorate was detected in 2 out of 26 samples at concentrations up to 9.0 micrograms per liter. No federal maximum contaminant level (MCL) exists for perchlorate, and no health-based violations have been recorded for this system.

Perchlorate differs from other common water issues like hardness or chlorine taste, which primarily affect the aesthetic qualities of water. Instead, it is a chemical that can originate from industrial sources or natural processes, and it interacts differently in water treatment processes. Unlike substances that cause staining or odor, perchlorate’s presence in this system is documented but not reported as unsafe or exceeding any regulatory limit.

Treated Water at the Tap Reflects Changes After Using Specific Perchlorate Technology

When a household uses an Autotrol Perchlorate Filter designed for perchlorate removal, the treated water reaching fixtures can change in measurable ways. This technology targets perchlorate molecules specifically, reducing their concentration in the water supply for the home. The system ships ready to configure and operates by filtering water through a specialized media that binds perchlorate, differing from treatment approaches for other contaminants.

Because perchlorate is only one constituent among many in groundwater, the filter aims to improve water quality without affecting the presence of minerals responsible for taste or hardness. This results in water that can better meet the resident's expectations for drinking and cooking purposes concerning perchlorate.

Daily Household Water Use Helps Determine the Needed Treatment Capacity

Understanding how much water your household consumes each day is essential before selecting the appropriate treatment capacity. The Lacey Water Department serves thousands of homes with various water use patterns, but individual household demand can vary widely based on family size, appliance use, and lifestyle.

Evaluating daily water use in gallons allows you to match the Autotrol Perchlorate Filter's capacity to your needs. The system is designed to handle residential volumes typical for Thurston County homes supplied by groundwater. Measuring your household's demand ensures the filter operates efficiently without overextending its ability to reduce perchlorate.

First-Affected Water Fixtures and Appliances Indicate Where Perchlorate Levels Matter Most

Perchlorate impacts are primarily a concern for water used in drinking, cooking, and other consumption-related fixtures. Faucets and kitchen appliances that use tap water for food preparation are the first points where perchlorate levels become relevant. Showerheads, washing machines, and irrigation systems are less affected since perchlorate ingestion is the main focus rather than external contact.

By targeting treatment at the whole-house level, the documented technology helps ensure that the water entering these critical fixtures has reduced perchlorate concentration, aligning with the homeowner's preference to minimize exposure.

Government Sampling Shows Seasonal and Multi-Year Trends for Perchlorate in Thurston County

The EPA's unregulated contaminant monitoring for the Lacey Water Department system took place between July 2002 and January 2003. In that period, perchlorate was detected 2 times out of 26 samples, with levels between 8.0 and 9.0 micrograms per liter. These results represent a snapshot over about six months and indicate low but measurable presence in groundwater.

Because this was an occurrence survey rather than a compliance test, it does not establish trends beyond that timeframe or predict future water quality. Changes in perchlorate levels over seasons or years would require additional monitoring. Homeowners concerned about perchlorate can test their own water to understand current conditions specific to their property.

Choosing treatment suited to your household water demand, such as the Autotrol Perchlorate Filter, can provide peace of mind regarding perchlorate reduction based on your water use and test results.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2003-01-23. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR1 monitoring (2001-2005) for LACEY WATER DEPARTMENT (WA5343500), WA: 26 results across 1 listed contaminants, 2 detections above the reporting level; no federal MCL