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Effluent Guidelines

Glass Manufacturing Effluent Guidelines

""EPA initially promulgated the Glass Manufacturing Effluent Guidelines and Standards (40 CFR Part 426) in 1974 and 1975, and amended the regulation in 1979 and 1986. The regulation covers directHelpdirect dischargerA point source that discharges pollutants to waters of the United States, such as streams, lakes, or oceans. and indirectHelpindirect dischargerA facility that discharges pollutants to a publicly owned treatment works (municipal sewage treatment plant). dischargers. The Effluent Guidelines and Standards are incorporated into NPDES permits for direct dischargers and permits or other control mechanisms for indirect dischargers (see Pretreatment Program).

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What is the Glass Manufacturing Industry?

The glass industry manufactures a diverse array of products, including plate glass, glass bottles and containers, automobile windshields, glass tubing, and insulation fiberglass. Raw materials include silica, soda ash, limestone, dolomite and other chemicals.
Wastestreams include:
  • Cullet quenching
  • Cooling water (usually non-contact)
  • Air emission control devices (e.g. scrubbers)
  • Product rinsing
Glass manufacturing is included within the following NAICS groups:
  • 3272 – Glass and glass product manufacturing
  • 327993 – Mineral wool manufacturing
The NAICS listing is provided as a guide and does not define the coverage of the Glass Manufacturing category. For precise definitions of coverage, see the applicability sections in 40 CFR Part 426.

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Pollutants and Subcategories

Regulated Pollutants

Effluent limitations vary by subcategory. Some wastestreams have zero discharge requirements.
  • ammonia
  • BOD5
  • COD
  • fluoride
  • lead
  • oil
  • phenol
  • phosphorus
  • pH
  • TSS
Some of the sections in Part 426 (§§ 426.24, 426.34, 426.44, 426.64, 426.106, and 426.132) contain the abbreviation “Do.” for “ditto.”

Regulation Subcategories

  1. Insulation Fiberglass
  2. Sheet Glass
  3. Rolled Glass
  4. Plate Glass
  5. Float Glass
  6. Automotive Glass Tempering
  1. Automotive Glass Laminating
  2. Glass Container
  3. Glass Tubing (Danner process)
  4. Television Picture Tube Envelope
  5. Incandescent Lamp Envelope
  6. Hand Pressed and Blown Glass
(Subpart I is reserved.)

Rulemaking History


Initial Rulemaking

1975 rule

Subparts H-M; BPT, BAT, NSPS, PSNS
  • Documents, including:
    • Final Rule (January 16, 1975)
    • Development Document – Pressed and Blown Glass (Subparts H-M) (January 1975)
      Industry description, wastewater characterization, treatment technologies, regulatory compliance cost estimates and pollutant loadings for the final rule
    • Proposed Rule (August 21, 1974)

1974 rules

Subparts B-G; BPT, BAT, NSPS, PSNS
  • Documents, including:
    • Final Rule (February 14, 1974)
    • Development Document – Flat Glass (Subparts B-G) (January 1974)
    • Proposed Rule (October 17, 1973)
  • Documents, including:
    • Final Rule (January 22, 1974)
    • Development Document – Insulation Fiberglass (January 1974)
    • Proposed Rule (August 22, 1973)

Additional Information

For additional information regarding Glass Manufacturing Effluent Guidelines, please contact Phillip Flanders ( or 202-566-8323.

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