Maryland Pretreatment Standards regulations & environmental compliance analysis

Maryland Pretreatment Standards: What you need to know

Governing Law and Regulations

Pretreatment requirements to control industrial users of publicly owned treatment works (POTWs): Code of Maryland Regulations (COMAR) to

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Applicability: COMAR

Reporting requirements: COMAR

Variances: COMAR

Enforcement authority: COMAR

Financial assistance: COMAR

Loan applications: COMAR

Eligible costs: COMAR

Loan conditions: COMAR

Regulatory Agencies

Maryland Department of the Environment (MDE) Water Management Administration

U.S. Environmental Protection Agency (EPA) Region 3

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Maryland is authorized by the U.S. Environmental Protection Agency (EPA) to administer the federal pretreatment program. Maryland's pretreatment requirements are similar to the federal standards with additional enforcement measures. See the national section PRETREATMENT STANDARDS for more information on the federal requirements.

Administration and enforcement. MDE's Water Management Administration is authorized to administer the pretreatment program requirements in Maryland.

State Requirements



Maryland's state pretreatment program applies to industrial users who discharge industrial waste, either directly or indirectly, into POTWs. The state's pretreatment rules are mandatory if:

  • More than 5 million gallons per day are involved in the total design flow.
  • Pollutants discharged by the user pass through or cause interference to POTWs.

As a tool to administer state and national pretreatment requirements, ...

Read more about Pretreatment Standards