Minnetrista staff urges HOA outreach and targeted surveys as MPCA permit renewal looms for stormwater ponds

City staff briefed the council on the SWAMP (stormwater asset management program) inventory, emphasizing that while public ponds generally score above the city’s 65 threshold, most stormwater assets in Minnetrista are privately owned and many private ponds scored below the threshold.

Staff explained the practical challenge: the next MPCA (Minnesota Pollution Control Agency) permitting cycle (anticipated in 2025) may require cities to demonstrate efforts to address privately owned best management practices (BMPs). Staff recommended a prioritized approach: identify ponds that were built after the city’s stormwater taxing‑district policy (post‑February cutoff noted in the packet) because those are the ponds less likely to be covered by assessment mechanisms; seek personal contacts within HOAs before sending form letters; and commission bathymetric surveys on priority ponds to quantify sediment volumes. Staff provided a bathymetry cost range (roughly $800 to $15,000 depending on pond size) and noted dredging/disposal costs vary widely depending on sediment volumes and contamination levels.

Councilmembers raised practical concerns: access constraints where ponds sit behind houses, the financial infeasibility of assessing reclamation costs across a small number of large lots, and the potential for upsetting residents if the city immediately pursues aggressive remediation on older ponds. Several members suggested beginning with easier, more accessible ponds (for example, some in Hunter’s Crest and Palmer Point) and building a demonstrable record of effort for regulators.

Staff committed to: produce a list of SWAMP ponds built before/after the taxing‑district policy, use personal outreach to identified HOAs where possible, prioritize baths for ponds that drain to notably degraded downstream waterbodies (e.g., Jennings Bay), and return to council in September with initial survey results and outreach outcomes.