EQB hears multi-agency plan to address nitrate in groundwater; MDH to lead immediate public-health response

The Environmental Quality Board on April 17 heard an extended multi-agency briefing on nitrate contamination in Minnesota groundwater and steps agencies will take to protect public health and reduce sources of nitrate.

Executive Director Catherine Neuschler summarized the issue and the state’s approach: a three-phase response prompted by petitions to the U.S. Environmental Protection Agency and EPA directives. MDH will lead phases 1 and 2 focused on protecting people from exposure; MDA and MPCA will lead phase 3 aimed at preventing nitrate from entering water resources.

Tanny Eschenauer, water policy manager at the Minnesota Department of Health, described the public-health priorities. MDH’s health risk limit for nitrate is 10 milligrams per liter, and Eschenauer said, “drinking water at 10 milligrams per liter and below is safe for everyone.” MDH emphasized infants under 1 year and pregnant people as highest-priority groups and said the state lacks a comprehensive inventory of private wells; staff estimated about 1,000,000 private well users statewide and roughly 100,000 in the eight-county Southeast Minnesota area.

Between now and June (phase 1), MDH will use existing Clean Water Fund dollars for outreach and limited alternate water to high-priority households, and it secured a small amount of funding for free tests and bottled water for the most vulnerable. Beginning July 1 (phase 2), MDH plans a broader public-health intervention contingent on funding: a well inventory (using interns), free private well testing for recommended contaminants, mitigation including reverse osmosis systems or well repairs, a private-well stewards network with the University of Minnesota, and a public dashboard that maps nitrate levels and agency response.

Margaret Wagner of the Minnesota Department of Agriculture summarized MDA’s long-running nitrogen fertilizer management plan and the 2019 Groundwater Protection Rule. MDA’s township testing program (which ran over seven years) provided free private-well testing to roughly 90,000 residences and helped prioritize work in vulnerable areas. Wagner described the rule’s two parts: fall fertilizer application restrictions in vulnerable areas (about 12% of cropland statewide; in Southeast Minnesota they apply to about 71% of cropland, roughly 1,100,000 acres) and drinking-water-supply management-area tiers that trigger local advisory teams and voluntary-to-regulatory pathways when adoption thresholds or worsening water quality criteria are met.

Glenn Scuda of the Pollution Control Agency described MPCA actions: tightened feedlot-related permit conditions in the last permit cycle, additional proposed permit requirements (visual inspections for land application, strengthened manure-transfer tracking and setbacks, more storage capacity to avoid high‑risk application timing), and plans to open permit language to public notice this summer and pursue rule amendments later in the year. MPCA also is updating the statewide nutrient reduction strategy and recently issued a wastewater nitrogen reduction strategy that will inform future rulemaking.

Board members pressed agencies on technical details and implementation scale. Member Nelson asked about health‑outcome measures; MDH noted blue‑baby syndrome is not reportable and that current evidence supports keeping 10 mg/L as the protective health limit. Members also asked how the MPCA cumulative impacts rulemaking and EQB’s environmental review work would intersect; agencies said they will track and participate in related rulemaking and that changes to environmental review may be considered once the lay of the land is clearer.

Agencies emphasized the need to scale up proven practices (cover crops, perennial cover, vegetative buffers, timing and placement of fertilizer, manure management) and to target them to vulnerable groundwater areas defined by soils and geology. Funding for implementation currently relies heavily on the Clean Water Fund and state appropriations, with substantial leveraging of federal funds such as RCPP and NRCS EQIP.

No formal board action was taken on the state water plan item; presenters committed to return to the board with additional analysis and to participate in future detailed discussions.