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Enhanced Nutrient Removal-Cox Creek Water Reclamation Facility Upgrades


ENR upgrades at plants with similar capacity call for the construction of additional concrete settling tanks.  With virtually no room to expand (as shown above), DPW is using a state-of-the-art technology known as Membrane Bioreactor Filtration (MBR) as well as revised biological processes to eliminate the need to increase the plant's footprint on the edge of the Patapsco River.

Project Information
Project ManagerRichard Meehan
Phone number410-571-0092
ContractorsPC Construction
Inspection ManagerBlack & Veatch
Project Investment$162.6 million
Phase I StartMarch 2010
Phase II StartJuly 2013
Completion Date 2016
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Highlighted Capital Projects



  • One of seven active Enhanced Nutrient Removal (ENR) projects pursued by County in compliance with theState‚Äôs Bay Restoration Program.
  • The overall County investment to upgrade each WRF totals more than $200 million.
  • When complete, nitrogen concentrate levels will be reduced from 8mg/L to 3 mg/L and phosphorus from 2 m/L to 0.3 mg/L.
  • ENR upgrades at the Cox Creek Water Reclamation Facility (WRF) represents the largest capital investment ($162 million) in County history.

Phase I

  • Reduction of existing primary clarifier tanks.

Phase II

  • Concentration of new membrane building at             vacated primary clarifier location.


  • Improves the quality of our local waterways. 
  • Improves the quality of the Chesapeake Bay.
  • Meets Bay Restoration Program pollutant limits.
  • Significantly reduces nitrogen/phosphorous discharge.
  • 89% of overall project cost funded by State grants.

Project Updates


2012Phase I Construction complete
Jul 2013Phase II construction began
Dec 2013Construction ongoing
May 2014Construction ongoing in all areas, including the Reactors, The Membrane Bioreactor and the High flow building. Currect focus is on concrete and structural operations.



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Anne Arundel County, Maryland. 44 Calvert Street, Annapolis, Maryland 21401 | Tele: (410) 222-7000