Part 4720.5550 - CRITERIA FOR ASSESSING WELL VULNERABILITYSubpart 1.Department determination.The department shall use the criteria specified in this part to assign priority and notify a public water supplier in writing that a wellhead protection plan must be prepared for an existing well.
Subp. 2.Well vulnerability criteria.A public water supply well is vulnerable if:
A. the well water contains ten milligrams per liter or more nitrate plus nitrite nitrogen;B. the well water contains quantifiable levels of pathogens as defined in part 7040.0100, subpart 26, or chemical compounds that indicate groundwater degradation as defined in Minnesota Statutes, section 103H.005, subdivision 6;C. the well water contains one tritium unit or more when measured with an enriched tritium detection method; orD. an enriched tritium analysis of the well water has not been performed within the past ten years; and (1) information on the well construction is not available; or(2) the geological material from the land surface to where the groundwater enters the public water supply well is:(b) solution weathered bedrock;(d) unconsolidated material 0.062 millimeters (fine sand) or larger; or(e) a combination of the materials specified in units (a) to (d).Minn. R. agency 144, ch. 4720, GENERAL WELLHEAD PROTECTION REQUIREMENTS AND CRITERIA, pt. 4720.5550
Statutory Authority: MS s 103I.101