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Changes on the Horizon Safe Drinking Water Act

No-Lead Brass Rule

Upcoming Water Treatment Workshop

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MPCA Proposes Changes to Phosporus Standards

The Minnesota Pollution Control Agency (MPCA) has developed draft total phosphorus (TP) limits for lakes and rivers in the State. An overabundance of phosphorus can cause algae blooms, giving the water an unattractive, slimy green appearance and can deplete dissolved oxygen. According to an MPCA study, phosphorus most often makes its way into Minnesota lakes through farm and feedlot runoff as well as seepage from septic tanks.

The MPCA presented the draft water quality standards at a recent Central States Water Environment Federation conference. The agency has divided the State into three eco-regions and each will have different in-stream TP limits, ranging from 0.055 mg/L to 0.15 mg/L.

However, AE2S Wastewater Group Manager Scott Schaefer, PE, says the proposed standard does not mean future end-of-pipe discharge permit limits will be 0.055 mg/L to 0.15 mg/L. Schaefer says there are many factors that will influence the translation of in-stream standards into discharge permit limits, including receiving stream flow characteristics and background phosphorus concentrations.

Schaefer also says that total nitrogen limits are not being proposed at this time, but the combination of ammonia standards and potentially tighter future nitrate standards could result in a de-facto total nitrogen standard.

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please contact Heather Syverson at 701-364-9111 or Heather.Syverson@ae2s.com.
 
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