Local Aquifer and Water System Overview
Water for Moses Lake City of public system in Grant County, Washington, primarily comes from groundwater sources. This system serves over 32,000 residents with water delivered through more than 13,000 connections. Water from such aquifers moves through underground layers before reaching treatment facilities and, finally, household taps.
1. Firefighting Foam, Textile Finishing, and Landfill Sources: Which Fits This Region's Record
PFAS compounds, sometimes called "forever chemicals," originate in various industrial uses including firefighting foam, textile finishing, and landfill leachate. In Grant County's Moses Lake water system, PFOS and PFHxS showed detections, reflecting their presence in the local environment, while PFOA and other PFAS compounds were less frequently or not detected. These detections hint at potential historical or environmental sources but do not indicate a violation or health hazard.
2. Why PFOA and PFOS Are Measured in Nanograms per Liter and What Four Decimal Places Mean
The PFAS levels are quantified in micrograms per liter (µg/L), corresponding to parts per billion or trillion when converted. For example, the reporting level for PFOA is 0.004 µg/L, which is 4 nanograms per liter (ng/L) or parts per trillion (ppt). Measurements with four decimal places signify precise laboratory detection limits, identifying even trace amounts of these fluorinated compounds in water samples.
3. How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
The 2023–2025 UCMR5 monitoring for Moses Lake included 36 samples. The PFOS compound was detected above the reporting level in 2 instances, with the highest value around 52 nanograms per liter. PFHxS appeared above reporting limits 5 times, with highest near 54 nanograms per liter. Such a sample size provides a snapshot but not exhaustive coverage, so individual household water could differ, requiring personal testing to confirm specific concentrations.
4. How the Treated Water Differs at the Tap Once the Documented Technology Is in Place
Addressing PFAS in residential water often involves point-of-entry filtration systems designed for these substances. The C-Series PFAS Forever Chemicals Filter ships ready to configure for household use, targeting a broad range of per- and polyfluoroalkyl substances. This technology reduces detected compounds like PFOS and PFHxS, improving water quality at the tap by lowering the presence of 'forever chemicals' that may accumulate in water supplies.
5. How the UCMR5 Survey Differs from UCMR3 in Which Compounds It Looked For and at What Level
The UCMR5 program expanded the list of analyzed PFAS compounds relative to the earlier UCMR3 survey, incorporating newer substances such as PFHxS and others with lower detection thresholds. This means the current survey offers a more detailed and sensitive assessment of fluorinated chemicals in water sources, strengthening regional data on these emerging contaminants.
6. How to Compare This Area's Record With a Neighboring County's Without Overreading It
While Grant County's Moses Lake system shows some detections of PFOS and PFHxS, comparing these findings to adjacent counties requires caution. Differences in industrial activities, aquifer characteristics, and sampling frequency affect results. Overinterpreting shifts between counties can mislead homeowners; instead, understanding the local record's scope helps place these numbers in context for informed decisions.
Summary: Grant County's public water system data show limited detections of select PFAS compounds without health-based violations. Considering these findings, households evaluating treatment options should test their own water and may find benefit in a dedicated solution like the C-Series PFAS Forever Chemicals Filter to reduce PFAS concentrations at the tap.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2025-01-16. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for MOSES LAKE CITY OF (WA5356300), WA: 360 results across 10 listed contaminants, 9 detections above the reporting level; 3 results above a 2024 federal MCL