Regulations last checked for updates: May 01, 2025
Title 40 - Protection of Environment last revised: Nov 01, 2025
§ 466.20 - Applicability; description of the cast iron basis material subcategory.
This subpart applies to discharges to waters of the United States and introductions of pollutants into publicly owned treatment works from porcelain enameling of cast iron basis materials.
§ 466.21 - Effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
(a) There shall be no discharge of process wastewater pollutants from metal preparation operations.
(b) The discharge of process wasterwater pollutants from all porcelain enameling coating operations shall not exceed the values set forth below:
Subpart B—BPT Effluent Limitations
| Pollutant or pollutant Property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
|
|
|
|
|
|---|
| | Mg/m
2 (pounds per/1million ft
2) of Area Coated
|
| Chromium | 0.29 | (0.06) | 0.12 | (0.024)
|
| Lead | 0.11 | (0.02) | 0.09 | (0.02)
|
| Nickle | 0.98 | (0.02) | 0.7 | (0.15)
|
| Zinc | 0.93 | (0.19) | 0.39 | (0.08)
|
| Aluminum | 3.16 | (0.65) | 1.29 | (0.27)
|
| Iron | 0.86 | (0.18) | 0.44 | (0.09)
|
| Oil and grease | 13.86 | (2.84) | 8.32 | (1.71)
|
| TSS | 28.42 | (5.82) | 13.86 | (2.84)
|
| pH | (
1) | (
1) | (
1) | (
1)
|
§ 466.22 - Effluent limitation representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
Except as provided in 40 CFR 125.30 through 125.32, any existing point source subject to this subpart must achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
(a) There shall be no discharge of process wastewater pollutants from metal preparation operations.
(b) The discharge of process wastewater pollutants from all porcelain enameling coating operations shall not exceed the values set forth below:
Subpart B—BAT Effluent Limitations
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
|
|
|
|
|
|---|
| | Mg/m
2 (pounds per/million ft
2) of area coated
|
| Chromium | 0.53 | (0.11) | 0.22 | (0.05)
|
| Lead | 0.19 | (0.04) | 0.16 | (0.03)
|
| Nickel | 1.78 | (0.37) | 1.26 | (0.26)
|
| Zinc | 1.68 | (0.35) | 0.71 | (0.15)
|
| Aluminum | 5.74 | (1.18) | 2.35 | (0.48)
|
| Iron | 1.55 | (0.32) | 0.79 | (0.16) |
§ 466.23 - New source performance standards.
Any new source subject to this subpart must achieve the following new source performance standards.
(a) There shall be no discharge of process wastewater pollutants from metal preparation operations.
(b) The discharge of process wastewater pollutants from all porcelain enameling coating operations shall not exceed the values set forth below:
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
|
|
|
|
|
|---|
| | Mg/m
2 (pounds per million ft
2) of area coated
|
| Chromium | 0.47 | (0.10) | 0.19 | (0.04)
|
| Lead | 0.13 | (0.03) | 0.11 | (0.02)
|
| Nickel | 0.69 | (0.14) | 0.47 | (0.10)
|
| Zinc | 1.29 | (0.27) | 0.53 | (0.11)
|
| Aluminum | 3.82 | (0.78) | 1.56 | (0.32)
|
| Iron | 1.55 | (0.32) | 0.79 | (0.16)
|
| Oil and grease | 12.60 | (2.58) | 12.60 | (2.58)
|
| TSS | 18.91 | (3.87) | 15.12 | (3.10)
|
| pH | (
1) | (
1) | (
1) | (
1)
|
§ 466.24 - Pretreatment standards for existing sources.
(a) Except as provided in 40 CFR 403.7 and 403.13, any existing source subject to this subpart which introduces pollutants into a publicly owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for existing sources.
(1) There shall be no discharge of process wastewater pollutants from metal preparation operations.
(2) The discharge of process wastewater pollutants from all porcelain enameling coating operations shall not exceed the values set forth below:
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
| | Milligrams per liter (mg/l)
|
| Chromium | 0.42 | 0.17
|
| Lead | 0.15 | 0.13
|
| Nickel | 1.41 | 1.00
|
| Zinc | 1.33 | 0.56 |
(b) In cases when POTW find it necessary to impose mass pretreatment standards the following equivalent mass standards are provided.
(1) There shall be no discharge of process wastewater pollutants from metal preparation operations.
(2) The discharge of process watewater pollutants from all porcelain enameling costing operations shall not exceed the values set forth below:
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
|
|
|
|
|
|---|
| | Metric units—mg/m
2 (English Units—pounds per million ft
2) of area coated
|
| Chromium | 0.53 | (0.11) | 0.22 | (0.05)
|
| Lead | 0.19 | (0.04) | 0.16 | (0.03)
|
| Nickel | 1.78 | (0.37) | 1.26 | (0.26)
|
| Zinc | 1.68 | (0.35) | 0.71 | (0.15) |
§ 466.25 - Pretreatment standards for new sources.
Except as provided in 40 CFR 403.7, any new source subject to this subpart which introduces pollutants into a publicy owned treatment works must comply with 40 CFR part 403 and achieve the following pretreatment standards for new sources.
(a) There shall be no discharge of process wastewater pollutants from metal preparation operations.
(b) The discharge of process wastewater pollutants from all porcelain enameling coating operations shall not exceed the values set forth below:
| Pollutant or pollutant property
| Maximum for any 1 day
| Maximum for monthly average
|
|---|
|
|
|
|
|
|---|
| | Mg/m
2 (pounds per million ft
2) of area coated
|
| Chromium | 0.47 | (0.10) | 0.19 | (0.04)
|
| Lead | 0.13 | (0.03) | 0.11 | (0.02)
|
| Nickel | 0.69 | (0.14) | 0.47 | (0.10)
|
| Zinc | 1.29 | (0.27) | 0.53 | (0.11) |
authority: Secs. 301, 304 (b), (c), (e), and (g), 306 (b) and (c), 307 and 501 of the Clean Water Act (the Federal Water Pollution Control Act Amendments of 1972, as amended by the Clean Water Act of 1977) (the “Act”);
33 U.S.C. 1311,
1314,
c,
e, 1316 (b) and
c, 1317 (b) and
c,
and; 86 Stat. 816, Pub. L. 92-500; 91 Stat. 1567, Pub. L. 95-217
source: 47 FR 53184, Nov. 24, 1982, unless otherwise noted.
cite as: 40 CFR 466.25