Laserfiche WebLink
Contaminant <br />Lead <br />Table 5 — Water Quality - Primary Drir+kin Water Standards <br />Highest <br />Average or <br />Highest Single <br />Test Result <br />Range o <br />Detecte <br />est Resu <br />90% of <br />Results <br />Were Les. <br />Tha <br />1.9 ppb <br />90% of <br />homes less <br />than 15 ppb <br />Copper <br />90% of <br />- - - 0.82 ppm homes less <br />than 1.3 ppm <br />Barium 0.11 ppm - 2 ppm <br />Arsenic 1.49 ppb - 10.4 ppb <br />2,4-D 0.03 ppb - 70 ppb <br />Combined <br />Radium <br />2.2 pCi/I - 5.4 pCi/I <br />Total <br />Trihalomethanes 2.1 ppb <br />(TTHMs) <br />1.70 — 2.10 <br />ppb <br />80 ppb <br />Total Chlorine 1.14 ppm <br />0.77-1.64 <br />ppm <br />4.0 ppm <br />Fluoride 0.81 ppm 0.59 — 1.00 <br />ppm <br />Notes: Data from Ramsey's Consumer Confidence Report <br />4.0 ppm <br />3.2 Manganese <br />According to the Minnesota Department of Health (MDH), too much manganese in drinking water <br />can have negative health effects for babies under one year old. At high concentrations, <br />manganese can also have negative health effects for children and adults. To protect bottle-fed <br />infants, MDH recommends manganese levels of less than 0.100 mg/L. To protect children and <br />adults, a manganese level of less than 0.300 mg/L is recommended. To ensure that all residents <br />are protected, MDH has established a Health Based Value (HBV) for Manganese of 0.100 mg/L. <br />Manganese also has a secondary standard of 0.05 mg/L where levels above can cause color, <br />staining, and taste issues. <br />Recently, manganese was included as a contaminant to be monitored under the Fourth <br />Unregulated Contaminant Monitoring Rule (UCMR4), which is discussed in later in this chapter. <br />The City of Ramsey conducted UCMR4 sampling in 2019 which included sampling for <br />manganese. As shown in Table 6, Wells No. 1, 3, 4, and 8 tested above the MDH HBV. Due to <br />the high levels of manganese, MDH has recommended to the City that they develop short-, mid-, <br />and long-term plans to address the high levels. In response to the high levels, the City began <br />using wells with the lowest levels of manganese, and when required to use more wells during <br />higher demand times, the City developed a plan to mix the water from the low level wells with the <br />FEASIBILITY STUDY RAMSY 154354 <br />Page 10 <br />