The City of Wasilla Wastewater Treatment Plant was constructed in approximately 1989 to provide treatment for septic tank effluent. Effluent is treated in two aerated lagoons and disposed of in subsurface infiltration beds. A pilot study is being conducted to examine the use of the 77-acre parcel adjacent to the existing wastewater treatment plant for polishing treatment and/or disposal of effluent. The parcel consists primarily of wetlands and is owned by the City of Wasilla.

The pilot study will examine using the wetlands to naturally treat wastewater effluent. The initial concept is to apply treatment plant effluent to the vegetation and allow the natural gradient to slowly guide flow over the 77-acre parcel. Natural microbial and vegetation activity is expected to consume nutrients (i.e. nitrate) remaining in the wastewater. Nitrate is expected to act as a fertilizer and spur microbial and plant growth. This growth would consume the nitrate, further cleaning the wastewater. The pilot study will construct the basic infrastructure to measure the effectiveness of the wetland wastewater treatment concept. Construction for the proposed project is taking place between June 2018 and September 2018. Collection of background data on the area has begun. Pilot study discharges are anticipated to begin at the end of September.  Once treated effluent is discharged into the wetland, sampling will continue to determine impacts and effectiveness of the wetland disposal.

This website has been set up to share data collected. It will be updated as results become available.

If you have any questions or comments please contact:

Feasibility Study

• Draft Feasibility Study (body) as of April 2017
• Appendix A - Scoping Summary Report as of April 2017
• Appendix B - Geotechnical Report as of June 2018
• Appendix C - Hydrogeological Assessment as of October 2016
• Appendix D - Wetland Delineation as of December 2015
• Appendix E - Wetland Modeling as of April 2017
• Appendix F – Laboratory Results (See below for information)
• Appendix G - Pilot Study as of April 2018
• Appendix H - Estimate of Construction Costs as of April 2017
• Status Update Wastewater Outfall Pilot Study as of May 2019

Project Figures

• Sampling Locations
• Known Well Locations
• Geotechnical Cross Section

Construction Plans

• Treated Effluent Discharge Pilot Study

Field Data

• July 2017 – Surface Water Sampling
  • Field Report
  • Raw Lab Data
• August 2017 – Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• September 2017– Surface Water Sampling
  • Field Report
  • Raw Lab Data
• October 2017– Surface Water Sampling
  • Field Report
  • Raw Lab Data
• November 2017 – Surface Water Sampling
  • Field Report
  • Raw Lab Data
• December 2017 – Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• January 2018 –Surface Water Sampling
  • Field Report
  • Raw Lab Data
• February 2018 –Surface Water Sampling
  • Field Report
  • Raw Lab Data
• March 2018 – Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• April 2018 –Surface Water Sampling
  • Field Report
  • Raw Lab Data
• May 2018 –Surface Water Sampling
  • Field Report
  • Raw Lab Data
• June 2018 – Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• July 2018 – Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• August 2018 – Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• September 2018 – Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• October 2018 – Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• November 2018 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• December 2018 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• January 2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• February 2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• March 2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• April 2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• May 2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• June 2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• July 2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• August  2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• September 2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• October 2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• November2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• December 2019 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• January 2020 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• February 2020 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• March 2020 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• April 2020 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• May 2020 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• June 2020 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• July 2020 - Subsurface and Surface Water Sampling
  • Field Report
  • Raw Lab Data
• Effluent Discharge
  • Lab Data
  • Weekly Reports

Quarter Report

• Treated Effluent Discharge Pilot Study - October 2019
• Treated Effluent Discharge Pilot Study - December 2019

Public Meetings

• June 2018 Meeting Minutes