Proprietary Technology Assessment Protocol

To manage post-construction stormwater, engineers and designers can use stormwater best management practices found in the Georgia Stormwater Management Manual or they may choose a proprietary system. Proprietary systems are manufactured stormwater BMPs and treatment systems available from commercial vendors; these systems are designed to treat stormwater runoff and/or provide water quantity control. General information about proprietary systems can also be found in the Georgia Stormwater Management Manual: Volume 2.

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The Post-Construction Stormwater Technology Assessment Protocol (PCSTAP) characterizes a proprietary system’s effectiveness in removing Total Suspended Solids (TSS) from stormwater runoff and compares test results with vendor performance claims.

The PCSTAP is specific to the conditions within the District but does not include any additional, independent, field testing of the proprietary system by the District.

Which proprietary systems have PCSTAP concurrence?

To view the list of PCSTAP concurrences, please read the following list and acknowledge you understand by clicking the toggle in the yellow bar below.

  1. The objective of the Post-Construction Stormwater Technology Assessment Protocol (PCSTAP) is to characterize a proprietary system’s effectiveness in removing Total Suspended Solids (TSS) from stormwater runoff for an intended application (land use) and to compare test results with vendor performance claims.
  2. The PCSTAP is structured for conditions within the Metropolitan North Georgia Water Planning District (MNGWPD) and is only meant to collect information about TSS removal.
  3. The review of vendor data and subsequent concurrence and public dissemination using the PCSTAP guideline is not intended to be an approval process or an endorsement of any product by the MNGWPD.
  4. Local governments and other entities may use this information as part of their process to evaluate the suitability of these technologies or products.

I understand items 1-4 above as they relate to PCSTAP concurrence and would like to view the list.


Protocol Limitations, Release of Liability, and Disclosure

The Metropolitan North Georgia Water Planning District make no representation, endorsements, or warranties, express or implied, concerning the validity or suitability of this assessment method for any particular technology or product, or of the accuracy of the evaluation results produced using this protocol; and do not endorse, approve, make or permit to be made any claims based in whole or in part on these results to be asserted by the manufacturers of the systems or equipment assessed using this protocol. Purchasers and users of any proprietary systems presented by a manufacturer or other entity using this protocol should make their own independent analyses and evaluations concerning the usefulness or value of any stormwater technologies or combinations of technologies in considering whether to use any proprietary system for post-construction stormwater management. Use of the information generated under the PCSTAP constitutes acceptance of this limitation of liability.

Existing Concurrences

This is not an exhaustive list of the proprietary systems being used by utilities in the Metropolitan North Georgia Water Planning District.

Manufacturer Proprietary System PCSTAP Review Documents
ADS/ BaySaver Technologies BayFilter Concurrence Letter 

PCSTAP Summary

BioClean Modular Wetland System Concurrence Letter 

PCSTAP Summary

BioClean Kraken Filter Concurrence Letter

PCSTAP Summary

Contech Storm Filter Concurrence Letter 

PCSTAP Summary

Filterra Bioretention Filtration Systems Concurrence Letter 


Hydro International
(Southeast Culvert Inc)
Up-Flo Filter w/ CPZ Mix Filter Media Concurrence Letter 

PCSTAP Summary

Oldcastle PerkFilter Media Filtration Device  

Concurrence Letter

Rotondo StormGarden Biofilter System Concurrence Letter 


* A conditional concurrence means that the device submittal did not meet the full PCSTAP criteria, but was close enough to warrant an additional submittal period. The conditional concurrence letter describes the review findings and deficiencies in the submittal that are outstanding. A conditional occurrence is valid for 12 months after date of issuance and upon expiration will be removed from the District website.

Vendor Submission Process

Vendors may submit their proprietary systems for inclusion on the PCSTAP Concurrence List. The review fee is $7,000. This fee covers the time to provide a review of the PCSTAP application package but does not guarantee a positive outcome (i.e. letter of concurrence). Within two months of the submittal date of a complete PCSTAP application package, the review will be finalized, and the vendor will be notified of concurrence or denial.

Vendors may appeal a letter of denial by contacting the Metro Water District’s Stormwater Planning Manager at Appeals will be reviewed by MNGWPD staff and the PCSTAP Volunteer Review Committee which is comprised of engineers from local jurisdictions within the MNGWPD. There is no fee or timeframe for the review of appeals.

Vendors interested in submitting their proprietary system for PCSTAP review should follow these steps:

  1. Review the Post-Construction Stormwater Technology Assessment Protocol (PCSTAP)
  2. Assemble the PCSTAP application package that includes:
    1. PCSTAP Submittal Checklist
    2. Supporting documentation requested in the PCSTAP
  3. Contact the Metro Water District’s Stormwater Planning Manager at, to receive an invoice for the $7,000 review fee and a link to submit your PCSTAP application package for review. The two month timeframe will begin once the $7,000 review fee and complete PCSTAP application package has been received by the Metropolitan North Georgia Water Planning District.

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