Local Aquifer and Household Water Delivery
The Yakima County aquifer is tapped by wells ranging from 21 to 795 feet deep, supplying water that moves through household plumbing to taps and appliances. Groundwater quality here has been sampled extensively, revealing a wide range of inorganic nitrogen levels, which include nitrate and nitrite compounds. Water reaching your home is influenced by these aquifer conditions but individual levels require direct testing.
Fixtures and Appliances Most Sensitive to Nitrate
Nitrate primarily affects water used for drinking and cooking, often first noted in kitchen faucets. Water heaters and filtration devices can also show effects over time. Because nitrate compounds can impact water taste and have potential health implications at higher levels, these fixtures are critical points of concern.
Household vs. Commercial Questions
While commercial or industrial users consider scale, flow rates, and regulatory compliance, residential users mainly focus on safe drinking water and appliance longevity. Household concerns often center on health-based nitrate thresholds and how to verify whether their water meets those standards, without the complexity of large-volume treatment needs.
Influence of Plumbing Materials and Age
Plumbing materials and the age of pipes can affect nitrate concentration measurements in household water separate from the source. Older plumbing may contribute to changes in water composition or affect test results, making it important to consider both source water and plumbing when assessing nitrate levels.
Aesthetic Secondary Standards vs. Health-Based Limits
Secondary standards address taste, staining, and corrosivity, which nitrate may influence indirectly, but are not health-based. In Yakima County aquifer samples, nitrate levels range widely, with a median of 5.29 mg/L. The federal health-based maximum contaminant level (MCL) for nitrate is 10.0 mg/L, with some samples exceeding this. However, detection alone does not define a health risk; compliance with the MCL is the critical health measure.
Steps to Identify Your Water’s Nitrate Level
Begin with inexpensive point-of-use tests for nitrate presence. These can indicate whether further analysis is warranted. The definitive step is a certified laboratory test of your own well or water source, which provides specific nitrate concentration. This distinction is essential because regional data from Yakima County wells cannot substitute for your specific water analysis.
Long-Term Effects of Untreated Elevated Nitrate
Consistently elevated nitrate levels over years may pose health concerns, especially for vulnerable groups like infants and pregnant women. Unaddressed, nitrate can degrade household water quality, potentially affecting appliances and drinking water safety per federal guidelines.
Recommended Testing and When Treatment Is Indicated
The essential test is a certified laboratory analysis measuring nitrate and nitrite concentration in your household water. A result above 10.0 mg/L nitrate signals the point where treatment options merit consideration. The C-Series Nitrate & Nitrite (Well) Filter ships ready to configure, designed to reduce these compounds and ensure safer water quality for residential use.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2024-01-11. 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 Inorganic nitrogen (nitrate and nitrite) in the aquifer (Yakima County): 887 results from 178 wells, median 5.29 mg/L, range 0.057-45.2 mg/L; 183 above a health-based federal MCL (federal MCL 10.0 mg/L)