01-06-2020 Council Work Session Packet

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▪ If everyone in your household is more than one year old, a safe level of manganese in your water is 300 μg/L or less. City of Lino Lakes received the attached letter from the MDH regarding UCMR4 as it relates to the City’s drinking water. The City’s Well Nos. 3 and 4 were randomly selected by EPA to be tested and monitored by MDH under UCMR4. The test results from MDH, Well No. 3 contains 367 micrograms of manganese per liter of water (μg/L), and Well No. 4 contains 82.7 μg/L (1 μg/L = 1 Part Per Billion (PPB)). The City requested additional testing from MDH to obtain a uniform baseline of data. The December 31, 2019 MDH test results for all the City’s wells: City Well Number Manganese Concentration (micrograms per liter) 1 158 2 527 3 322 4 84 5 143 6 408 MDH requires the test results from the UCMR4 monitoring to be published in a public water system’s annual Consumer Confidence Report (CCR) also referenced as the Drinking Water Report. The City is working with engineering consultants and MDH professionals on short-, mid-, and long-term plans to reduce the manganese levels in the City’s municipal drinking water. Short Term Solution- the City has reduced the manganese levels in the water supply by limiting the use of wells with high manganese levels. While this practice has lowered the manganese levels to below 300 ppb, a level that is safe for adult and child consumption, it is still recommended to consider bottled water for formula fed infants under the age of 12 months. The City is in the process of sending out informational letters to households and businesses that currently use the municipal water supply, and properties with private wells. The City also plans to hold a public informational meeting at 6:00 pm on Wednesday, January 22, 2020. Mid and Long Term Solutions- are being evaluated to permanently reduce the levels of manganese in drinking water. These options include: