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Virginia Administrative Code
Title 9. Environment
Agency 25. State Water Control Board
Chapter 900. Certification of Nonpoint Source Nutrient Credits
12/1/2021

9VAC25-900-40. Relationship to other laws and regulations.

A. Specific requirements regarding the use of nutrient credits are found in the following regulations and statutes:

1. Virginia Stormwater Management Program (VSMP) Regulation (9VAC25-870).

a. VSMP Individual Permits for Discharges from Construction Activities. As specified in § 62.1-44.19:21 B of the Act, those applicants required to comply with water quality requirements for land-disturbing activities operating under a construction individual permit issued pursuant to 9VAC25-870 may acquire and use perpetual nutrient credits placed on the registry for exchange.

b. VSMP Individual Permits for Municipal Separate Storm Sewer Systems. As specified in § 62.1-44.19:21 A of the Act, an MS4 permittee may acquire, use, and transfer nutrient credits for purposes of compliance with any wasteload allocations established as effluent limitations in an MS4 individual permit issued pursuant to 9VAC25-870. Such method of compliance may be approved by the department following review of a compliance plan submitted by the permittee that includes the use of nutrient credits and is in accordance with the provisions of § 62.1-44.19:21 A.

2. General VPDES Permit for Discharges of Stormwater from Construction Activities (9VAC25-880). As specified in § 62.1-44.19:21 B of the Act, those applicants required to comply with water quality requirements for land-disturbing activities operating under a general VSMP permit for discharges of stormwater from construction activities issued pursuant to 9VAC50-880 may acquire and use perpetual nutrient credits placed on the registry for exchange.

3. General VPDES Permit for Discharges of Stormwater from Small Municipal Separate Storm Sewer Systems (9VAC25-890). As specified in § 62.1-44.19:21 A of the Act, an MS4 permittee may acquire, use, and transfer nutrient credits for purposes of compliance with any wasteload allocations established as effluent limitations in an MS4 general permit issued pursuant to 9VAC25-890. Such method of compliance may be approved by the department following review of a compliance plan submitted by the permittee that includes the use of nutrient credits and is in accordance with the provisions of § 62.1-44.19:21 A.

4. Virginia Pollutant Discharge Elimination System (VPDES) Permit Regulation (9VAC25-31). As specified in § 62.1-44.19:21 C of the Act, owners of confined or concentrated animal feeding operations issued individual permits pursuant to 9VAC25-31 may acquire, use, and transfer credits for compliance with any wasteload allocations contained in the provisions of a VPDES permit. Such method of compliance may be approved by the department following review of a compliance plan submitted by the permittee that includes the use of nutrient credits.

5. Virginia Pollutant Discharge Elimination System (VPDES) Permits for Discharges of Storm Water Associated with Industrial Activity. As specified in § 62.1-44.19:21 D of the Act, owners of facilities registered for coverage under 9VAC25-151 for the general VPDES permit or issued a VPDES permit regulating stormwater discharges that requires nitrogen and phosphorus monitoring at the facility may acquire, use, and transfer credits for compliance with any wasteload allocations established as effluent limitations in a VPDES permit. Such method of compliance may be approved by the department following review of a compliance plan submitted by the permittee that includes the use of nutrient credits.

6. General Virginia Pollutant Discharge Elimination System (VPDES) Watershed Permit Regulation for Total Nitrogen and Total Phosphorus Discharges and Nutrient Trading in the Chesapeake Bay Watershed in Virginia (9VAC25-820). Nutrient credits certified pursuant to this chapter may be acquired to offset mass loads of total nitrogen or total phosphorus discharged by new or expanded facilities regulated by 9VAC25-820.

B. This chapter shall not be construed to limit or otherwise affect the authority of the board to establish and enforce more stringent water quality-based effluent limitations for total nitrogen or total phosphorus in permits where those limitations are necessary to protect local water quality. The exchange or acquisition of credits pursuant to this chapter shall not affect any requirement to comply with such local water quality-based limitations.

Statutory Authority

§ 62.1-44.19:20 of the Code of Virginia.

Historical Notes

Derived from Virginia Register Volume 36, Issue 23, eff. September 1, 2020; amended, Virginia Register Volume 38, Issue 1, eff. September 29, 2021.

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