Why does well water quality vary seasonally?

Well water quality fluctuates seasonally due to environmental factors. Dry seasons can lead to higher concentrations of contaminants like arsenic and PFAS as water tables drop, while wet seasons often introduce microbial pollutants such as E. coli through surface runoff and increased infiltration.

Are private drinking water wells regulated in the United States?

No, the U.S. government does not regulate contaminants in private wells, which serve up to 14% of the population. Unlike public water systems, private well owners are responsible for monitoring and ensuring the safety of their drinking water.

Which contaminants are more prevalent in private wells during dry seasons?

According to a study in the arid Southwest, arsenic, PFOA, PFOS, and sucralose concentrations were significantly higher during dry seasons. Reduced water levels can concentrate these pollutants, leading to increased health risks.

Which contaminants are more common in private wells during wet seasons?

The study indicated that E. coli concentrations were higher during wet seasons. Increased rainfall can wash surface contaminants, including bacteria, into well systems, especially if wellheads are not properly sealed or maintained.

How can AMPAC USA help address seasonal well water contamination?

AMPAC USA provides advanced reverse osmosis and water purification systems engineered for maximum contaminant removal, including seasonal threats like arsenic, nitrates, E. coli, PFOA, and PFOS. With over 30 years of field experience, our solutions ensure reliable, safe water despite seasonal quality variations.

Seasonal Variation of Water Quality in Unregulated Domestic Wells

Sammy FaragAMPAC USA — August 1, 2019

By Sammy Farag . August 1, 2019

Seasonal Well Water Quality Variation is a big deal in today’s water treatment world. Here at AMPAC USA, we build top-tier systems that make sure homes, businesses, and industries get safe, clean water. Our systems are made to pull out as many contaminants as possible and keep working reliably for a long time.

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Int. J. Environ. Res. Public Health 2019, 16(9), 1569; https://doi.org/10.3390/ijerph16091569

(This article belongs to the Special Issue Drinking Water and Health Risks)

no-margin-top Abstract

In the U.S., up to 14% of people rely on private wells for their drinking water. The thing is, the U.S. government doesn’t regulate contaminants in these private wells. This study wanted to check the water quality of unregulated private wells within one mile (1.6 kilometers) of an effluent-dominated river in the arid Southwest. We also wanted to see how contaminant levels changed between wet and dry seasons, and if human sources were contributing by specifically measuring man-made organic contaminants like PFOA, PFOS, and sucralose. We collected samples during two dry seasons and two wet seasons over two years. Then, we checked for microbial contaminants ( concentrations were higher than what’s considered safe: 0.01 mg/L, 10 mg/L, and 1 colony forming unit (CFU)/100 mL, respectively. The PFOA and PFOS levels we measured were also higher than the Public Health Advisory level. Arsenic, PFOA, PFOS, and sucralose were significantly higher during the dry seasons, but

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About The Author

Sammy Farag

Sammy Farag is VP of Engineering at AMPAC USA, a Woods Cross, UT-based manufacturer of commercial and industrial water purification systems. He has 20+ years of hands-on experience sizing, installing, and commissioning reverse osmosis systems across municipal, industrial, and marine applications. AMPAC USA systems are NSF-certified and deployed in 60+ countries.