The City of Millville, located in a prime location for aquifer storage and recovery (ASR), is having issues with elevated nitrate in the Glenridge well, a public water supply sourced from the Cache Valley principal aquifer. To alleviate high nitrate, the city performed an initial injection and pumping test using the Glenridge well. Millville injected water from Garr Spring, another public water supply source of which they own water rights, into the Glenridge well for one week at a rate of 500 gallons per minute. They then pumped the well while monitoring geochemistry to determine the effects on the Cache Valley principal aquifer system. The pre-injection nitrate concentration in the Glenridge well was 7.65 mg/l nitrate as nitrogen, and the nitrate concentration after pumping more than 172% of the volume of water injected was 6.52 mg/l nitrate as nitrogen. There is likely some dispersion of the injected spring water via advection in the aquifer.

This study is an investigation of the feasibility of an aquifer storage and recovery project using the existing water supply infrastructure of the city of Millville, Utah. The project involved injecting water from a public water supply spring into a public water supply well. Geochemical analysis indicates that the major ion chemistry of the spring water is very similar to that of the principal aquifer, however, the spring water would likely cause minor geochemical changes in the groundwater due to oxidation. The study also showed that the injection well had elevated nitrate concentration which is likely due to septic systems in the area. Overall, the pilot tests showed that injection of water for storage would not be detrimental to the principal aquifer, which has significant storage abilities beyond the capacity of Millville’s water system; however elevated nitrate in the aquifer is a problem that should be addressed.

M63, Aquifer Storage and Recovery provides a general understanding of the principles of aquifer storage and recovery (ASR). The manual discusses the concept, regulations as they are applied nationally and by state, basic design and development criteria, and presents results of an inventory of ASR well sites nationally. Both successful projects and ones that faced challenges are profiled. M63 provides management, operations, and engineering staff with an understanding of ASR to help them make decisions on investigations and installations when problems or the need to expand supplies arise, as well as enough background to improve response to problems and challenges. Chapters include: • Groundwater Recharge and Storage Programs • Regulatory Requirements • Summary of ASR Programs in the United States • Challenges for ASR Programs in the United States • Planning and Construction of ASR Systems • Operation and Performance Monitoring of ASR Wells • Example ASR Programs in US • ASR Versus Other Groundwater Recharge and Storage Programs

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