D.C. Mun. Regs. tit. 21, § 1104
1104.1 The surface waters of the District shall be free from substances in amounts or combinations that do any one of the following:
1104.2 For the waters of the District with multiple designated uses, the most stringent standards or criteria shall govern.
1104.3 Class A waters shall be free of discharges of untreated sewage, litter and unmarked submerged or partially submerged man-made structures that would constitute a hazard to the users of Class A waters.
1104.4 The aesthetic qualities of Class B waters shall be maintained. Construction, placement or mooring of facilities not primarily and directly water oriented is prohibited in, on, or over Class B waters unless:
1104.5 Class C streams shall be maintained to support aquatic life and shall not be placed in pipes.
1104.6 Within tidally influenced Class C waters, concentrations of chlorophyll a in free-floating microscopic aquatic plants (algae) shall not exceed levels that result in ecologically undesirable consequences such as reduced water clarity, low dissolved oxygen, food supply imbalances, proliferation of species deemed potentially harmful to aquatic life or humans or aesthetically objectionable conditions or otherwise render tidal waters unsuitable for designated uses.
1104.7 Class E waters shall be free of unmarked submerged or partially submerged man-made objects that pose a hazard to users of these waters.
1104.8 Unless otherwise stated, the numeric criteria that shall be met to attain and maintain designated uses are as follows in Tables 1 through 3:
Table 1: Conventional Constituents Numeric Criteria
| Constituent | Class A | Class B | Class C |
|---|---|---|---|
| Chlorophyll aa,b (µg/L)(seasonal segment average) | |||
| July 1 through September 30 | — | — | 25 |
| Dissolved Oxygen (mg/L) | |||
| Instantaneous minimum (year-round)c | — | — | 5.0 |
| February 1 through May 31a,b | |||
| 7-day mean | — | — | 6.0 |
| Instantaneous minimum | — | — | 5.0 |
| June 1 through January 31a,b | |||
| 30-day mean | — | — | 5.5 |
| 7-day mean | — | — | 4.0 |
| Instantaneous minimumd | — | — | 3.2 |
| E. colie (MPN/100 mL) | |||
| Geometric mean (Geometric mean of 5 samples over a maximum period of 30 days) | 126 | — | — |
| Single Sample Value | 410 | — | — |
| Hydrogen Sulfide (maximum µg/L) | — | — | 2.0 |
| Oil and Grease (mg/L) | — | — | 10.0 |
| pH | |||
| Greater than | 6.0 | 6.0 | 6.0 |
| And less than | 8.5 | 8.5 | 8.5 |
| Secchi Deptha,b (m)(seasonal segment average) | |||
| April 1 through October 31 | — | — | 0.8 |
| Temperature (°C) | |||
| Maximum | — | — | 32.2 |
| Maximum change above ambient | — | — | 2.8 |
| Total Dissolved Gases (maximum % saturation) | — | — | 110 |
| Turbidity Increase above Ambient (NTU) | 20 | 20 | 20 |
a Attainment of the dissolved oxygen, water clarity and chlorophyll a water quality criteria that apply to tidal influenced Class C waters will be determined following the guidelines
documented in the 2003 United States Environmental Protection Agency publication: Ambient Water Quality Criteria for Dissolved Oxygen, Water Clarity and Chlorophyll a for the Chesapeake Bay and its Tidal Tributaries, EPA 903-R-03-002 (April 2003, Region III Chesapeake Bay Program Office, Annapolis, Maryland); 2004 Addendum, EPA 903-R-04-005 (October 2004); 2007 Addendum, EPA 903-R-07-003 CBP/TRS 285/07 (July 2007); 2007 Chlorophyll Criterion Addendum, EPA 903-R-07-005 CBP/TRS 288-07 (November 2007); 2008 Addendum, EPA 903-R-08-001 CBP/TRS 290-08 (September 2008); and 2010 Criterion Addendum, EPA 903-R-10-002 CBP/TRS-301-10 (May 2010).
b Shall apply to only tidally influenced waters.
c Shall apply to only nontidal waters.
d At temperatures greater than 29°C in tidally influenced waters, an instantaneous minimum dissolved oxygen concentration of 4.3 mg/L shall apply.
e The geometric mean criterion shall be used for assessing water quality trends and for permitting. The single sample value criterion shall be used for assessing water quality trends only.
Table 2: Trace Metals and Inorganics Numeric Criteria
| Constituenta Trace metals and inorganics in µg/L, except where stated otherwise (see Notes below) | Class C | Class Db | |
|---|---|---|---|
| CCC 4-Day Avg | CMC 1-Hour Avg | 30-Day Avg | |
| Ammonia, mg total ammonia nitrogen (TAN)/L | See Footnote g | See Footnote h | — |
| Antimony, total recoverable | — | — | 640 |
| Arsenic, dissolved | 150 | 340 | 0.14c |
| Cadmium, dissolved | See Footnotes d and e | See Footnotes d and e | — |
| Chlorine, total residual | 11 | 19 | — |
| Chromium, hexavalent, dissolved | 11e | 16e | — |
| Chromium, trivalent, dissolved | See Footnotes d and e | See Footnotes d and e | — |
| Copper, dissolved | See Footnotes d and e | See Footnotes d and e | — |
| Cyanide, free | 5.2 | 22 | 400 |
| Iron, dissolved | 1,000 | — | — |
| Lead, dissolved | See Footnotes d and e | See Footnotes d and e | — |
| Mercury, dissolved | 0.77e | 1.4e | 0.15 |
| Methylmercury (mg/kg, fish tissue residue) | — | — | 0.3 |
| Nickel, dissolved | See Footnotes d | See Footnotes d | 4,600 |
| and e | and e | ||
|---|---|---|---|
| Selenium, total recoverable | 5 | 20 | 4,200 |
| Silver, dissolved | — | See Footnotes d and e | 65,000 |
| Thallium, dissolved | — | — | 0.47 |
| Zinc, dissolved | See Footnotes d and e | See Footnotes d and e | 26,000 |
a For constituents without numerical criteria, standards have not been developed at this time. However, the National Pollutant Discharge Elimination System (NPDES) permitting authority shall address constituents without numerical standards in NPDES permit actions by using the narrative criteria for toxics contained in these water quality standards.
b The Class D human health criteria for metals will be based on total recoverable metals.
c The criteria is based on carcinogenicity of 10-6 risk level.
d The formulas for calculating the criterion for the hardness dependent constituents indicated above are as follows:
Table 2a: Formulas for Hardness-Dependent Constituentse
| Constituent | CCC | CMC |
|---|---|---|
| Cadmium | e(0.7977[ln(hardness)] - 3.909) | e(0.9789[ln(hardness)] - 3.866) |
| Chromium III | e(0.8190[ln(hardness)] + 0.6848) | e(0.8190[ln(hardness)] + 3.7256) |
| Copper | e(0.8545[ln(hardness)] - 1.702) | e(0.9422[ln(hardness)] - 1.700) |
| Lead | e(1.2730[ln(hardness)] - 4.705) | e(1.2730[ln(hardness)] - 1.460) |
| Nickel | e(0.8460[ln(hardness)] + 0.0584) | e(0.8460[ln(hardness)] + 2.255) |
| Silver | — | e(1.7200[ln(hardness)] - 6.590) |
| Zinc | e(0.8473[ln(hardness)] + 0.884) | e(0.8473[ln(hardness)] + 0.884) |
e The criterion is multiplied by the EPA conversion factor in Table 2b as specified in Subsection 1105.10:
Table 2b: Conversion Factors for Dissolved Metalsf
| Constituent | CCC | CMC |
|---|---|---|
| Cadmium | 1.101672 - [(ln hardness)(0.041838)] | 1.136672 - [(ln hardness)(0.041838)] |
| Chromium III | 0.860 | 0.316 |
| Chromium VI | 0.962 | 0.982 |
| Copper | 0.960 | 0.960 |
| Lead | 1.46203 - [(ln hardness)(0.145712)] | 1.46203 - [(ln hardness)(0.145712)] |
| Mercury | 0.85 | 0.85 |
| Nickel | 0.997 | 0.998 |
|---|---|---|
| Silver | — | 0.85 |
| Zinc | 0.986 | 0.978 |
f Hardness in in Tables 2a and 2b shall be measured as mg/L of calcium carbonate (CaCO₃). The minimum hardness value allowed for use in these formulas shall not be less than 25 mg/L as CaCO₃, even if the actual ambient hardness is less than 25 mg/L as CaCO₃. The maximum hardness value allowed for use in these formulas shall not exceed 400 mg/L as CaCO₃, even if the actual ambient water hardness is greater than 400 mg/L as CaCO₃.
g Criterion Continuous Concentration (CCC) for Total Ammonia:
(a) The CCC criterion for ammonia (in mg N/L) (i) shall be the thirty (30)-day average concentration for total ammonia computed for a design flow specified in Subsection 1105.5; and (ii) shall account for the influence of the pH and temperature as shown in Table 2b and Table 2c. The highest four (4)-day average within the thirty (30)-day period shall not exceed 2.5 times the CCC.
(b) The CCC criterion in Table 2c for the period March 1st through June 30th was calculated using the following formula, which shall be used to calculate unlisted values: CCC = [(0.0577/(1+10⁷.⁶⁸⁸-pH)) + (2.487/(1+ 10⁹H-7.688))] X MIN(2.85, 1.45 X 10⁰.⁰²⁸ X (²⁵-T)), where MIN indicates the lesser of the two values (2.85, 1.45 X 10⁰.⁰²⁸ X (²⁵-T)) separated by a comma.
(c) The CCC criterion in Table 2d for the period July 1st through February 28/29th, was calculated using the following formula, which shall be used to calculate unlisted values: CCC = [(0.0577/(1+10⁷.⁶⁸⁸-pH)) + (2.487/(1+ 10⁹H-7.688))] X [1.45 X 10⁰.⁰²⁸ X (²⁵-MAX(T,7))], where MAX indicates the greater of the two values (T,7) separated by a comma.
Table 2c. Total Ammonia (In Milligrams of Nitrogen Per Liter)
Ccc Criterion for Various Ph And Temperatures for March 1st Through June 30th
| pH | Temperature (°C) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 14 | 16 | 18 | 20 | 22 | 24 | 26 | 28 | 30 | |
| 6.50 | 6.67 | 6.67 | 6.06 | 5.33 | 4.68 | 4.12 | 3.62 | 3.18 | 2.80 | 2.46 |
| 6.60 | 6.57 | 6.57 | 5.97 | 5.25 | 4.61 | 4.05 | 3.56 | 3.13 | 2.75 | 2.42 |
| 6.70 | 6.44 | 6.44 | 5.86 | 5.15 | 4.52 | 3.98 | 3.42 | 3.00 | 2.64 | 2.32 |
| 6.80 | 6.29 | 6.29 | 5.72 | 5.03 | 4.42 | 3.89 | 3.42 | 3.00 | 2.64 | 2.32 |
| 6.90 | 6.12 | 6.12 | 5.56 | 4.89 | 4.30 | 3.78 | 3.32 | 2.92 | 2.57 | 2.25 |
| 7.00 | 5.91 | 5.91 | 5.37 | 4.72 | 4.15 | 3.65 | 3.21 | 2.82 | 2.48 | 2.18 |
| 7.10 | 5.67 | 5.67 | 5.15 | 4.53 | 3.98 | 3.50 | 3.08 | 2.70 | 2.38 | 2.09 |
| 7.20 | 5.39 | 5.39 | 4.90 | 4.31 | 3.78 | 3.33 | 2.92 | 2.57 | 2.26 | 1.99 |
| 7.30 | 5.08 | 5.08 | 4.61 | 4.06 | 3.57 | 3.13 | 2.76 | 2.42 | 2.13 | 1.87 |
| 7.40 | 4.73 | 4.73 | 4.30 | 3.97 | 3.49 | 3.06 | 2.69 | 2.37 | 2.08 | 1.83 |
|---|---|---|---|---|---|---|---|---|---|---|
| 7.50 | 4.36 | 4.36 | 3.97 | 3.49 | 3.06 | 2.69 | 2.37 | 2.08 | 1.83 | 1.61 |
| 7.60 | 3.98 | 3.98 | 3.61 | 3.18 | 2.79 | 2.45 | 2.16 | 1.90 | 1.67 | 1.47 |
| 7.70 | 3.58 | 3.58 | 3.25 | 2.86 | 2.51 | 2.21 | 1.94 | 1.71 | 1.50 | 1.32 |
| 7.80 | 3.18 | 3.18 | 2.89 | 2.54 | 2.23 | 1.96 | 1.73 | 1.52 | 1.33 | 1.17 |
| 7.90 | 2.80 | 2.80 | 2.54 | 2.24 | 1.96 | 1.73 | 1.52 | 1.33 | 1.17 | 1.03 |
| 8.00 | 2.43 | 2.43 | 2.21 | 1.94 | 1.71 | 1.50 | 1.32 | 1.16 | 1.02 | 0.897 |
| 8.10 | 2.10 | 2.10 | 1.91 | 1.68 | 1.47 | 1.29 | 1.14 | 1.00 | 0.879 | 0.773 |
| 8.20 | 1.79 | 1.79 | 1.63 | 1.43 | 1.26 | 1.11 | 0.973 | 0.855 | 0.752 | 0.661 |
| 8.30 | 1.52 | 1.52 | 1.39 | 1.22 | 1.07 | 0.941 | 0.827 | 0.727 | 0.639 | 0.562 |
| 8.40 | 1.29 | 1.29 | 1.17 | 1.03 | 0.906 | 0.796 | 0.700 | 0.615 | 0.541 | 0.475 |
| 8.50 | 1.09 | 1.09 | 0.990 | 0.870 | 0.765 | 0.672 | 0.591 | 0.520 | 0.457 | 0.401 |
| 8.60 | 0.920 | 0.920 | 0.836 | 0.735 | 0.646 | 0.568 | 0.499 | 0.439 | 0.386 | 0.339 |
| 8.70 | 0.778 | 0.778 | 0.707 | 0.622 | 0.547 | 0.480 | 0.422 | 0.371 | 0.326 | 0.287 |
| 8.80 | 0.661 | 0.661 | 0.601 | 0.528 | 0.464 | 0.408 | 0.359 | 0.315 | 0.277 | 0.208 |
| 8.90 | 0.565 | 0.565 | 0.513 | 0.451 | 0.397 | 0.349 | 0.306 | 0.269 | 0.237 | 0.208 |
| 9.00 | 0.486 | 0.486 | 0.442 | 0.389 | 0.342 | 0.300 | 0.264 | 0.232 | 0.204 | 0.179 |
Ccc Criterion for Various Ph And Temperaturesfor July 1st Through February 28th/29th
| pH | Temperature (°C) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 0-7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15* | 16* | |
| 6.50 | 10.8 | 10.1 | 9.51 | 8.92 | 8.36 | 7.84 | 7.35 | 6.89 | 6.46 | 6.06 |
| 6.60 | 10.7 | 9.99 | 9.37 | 8.79 | 8.24 | 7.72 | 7.24 | 6.79 | 6.36 | 5.97 |
| 6.70 | 10.5 | 9.81 | 9.20 | 8.62 | 8.08 | 7.58 | 7.11 | 6.66 | 6.25 | 5.86 |
| 6.80 | 10.2 | 9.58 | 8.98 | 8.42 | 7.90 | 7.40 | 6.94 | 6.51 | 6.10 | 5.72 |
| 6.90 | 9.93 | 9.31 | 8.73 | 8.19 | 7.68 | 7.20 | 6.75 | 6.33 | 5.93 | 5.56 |
| 7.00 | 9.60 | 9.00 | 8.43 | 7.91 | 7.41 | 6.95 | 6.52 | 6.11 | 5.73 | 5.37 |
| 7.10 | 9.20 | 8.63 | 8.09 | 7.58 | 7.11 | 6.67 | 6.25 | 5.86 | 5.49 | 5.15 |
| 7.20 | 8.75 | 8.20 | 7.69 | 7.21 | 6.76 | 6.34 | 5.94 | 5.57 | 5.22 | 4.90 |
| 7.30 | 8.24 | 7.73 | 7.25 | 6.79 | 6.37 | 5.97 | 5.60 | 5.25 | 4.92 | 4.61 |
| 7.40 | 7.69 | 7.21 | 6.76 | 6.33 | 5.94 | 5.57 | 5.22 | 4.89 | 4.59 | 4.30 |
| 7.50 | 7.09 | 6.64 | 6.23 | 5.84 | 5.48 | 5.13 | 4.81 | 4.51 | 4.23 | 3.97 |
| 7.60 | 6.46 | 6.05 | 5.67 | 5.32 | 4.99 | 4.68 | 4.38 | 4.11 | 3.85 | 3.61 |
| 7.70 | 5.81 | 5.45 | 5.11 | 4.79 | 4.49 | 4.21 | 3.95 | 3.70 | 3.47 | 3.25 |
| 7.80 | 5.17 | 4.84 | 4.54 | 4.26 | 3.99 | 3.74 | 3.51 | 3.29 | 3.09 | 2.89 |
| 7.90 | 4.54 | 4.26 | 3.99 | 3.74 | 3.51 | 3.29 | 3.09 | 2.89 | 2.71 | 2.54 |
| 8.00 | 3.95 | 3.70 | 3.47 | 3.26 | 3.05 | 2.86 | 2.68 | 2.52 | 2.36 | 2.21 |
| 8.10 | 3.41 | 3.19 | 2.99 | 2.81 | 2.63 | 2.47 | 2.31 | 2.17 | 2.03 | 1.91 |
| 8.20 | 2.91 | 2.73 | 2.56 | 2.4 | 2.25 | 2.11 | 1.98 | 1.85 | 1.74 | 1.63 |
| 8.30 | 2.47 | 2.32 | 2.18 | 2.04 | 1.91 | 1.79 | 1.68 | 1.58 | 1.48 | 1.39 |
| 8.40 | 2.09 | 1.96 | 1.84 | 1.73 | 1.62 | 1.52 | 1.42 | 1.33 | 1.25 | 1.17 |
|---|---|---|---|---|---|---|---|---|---|---|
| 8.50 | 1.77 | 1.66 | 1.55 | 1.46 | 1.37 | 1.28 | 1.20 | 1.13 | 1.06 | 0.990 |
| 8.60 | 1.49 | 1.40 | 1.31 | 1.23 | 1.15 | 1.08 | 1.01 | 0.951 | 0.892 | 0.836 |
| 8.70 | 1.26 | 1.18 | 1.11 | 1.04 | 0.976 | 0.915 | 0.858 | 0.805 | 0.754 | 0.707 |
| 8.80 | 1.07 | 1.01 | 0.944 | 0.885 | 0.829 | 0.778 | 0.729 | 0.684 | 0.641 | 0.601 |
| 8.90 | 0.917 | 0.860 | 0.806 | 0.756 | 0.709 | 0.664 | 0.623 | 0.584 | 0.548 | 0.513 |
| 9.00 | 0.790 | 0.740 | 0.694 | 0.651 | 0.610 | 0.572 | 0.536 | 0.503 | 0.471 | 0.442 |
*At 15°C and above, the criterion for July 1st through February 28th/29th is the same as the criterion for March 1st through June 30th.
h Criterion Maximum Concentration (CMC) for Total Ammonia:
(a) The CMC criterion for total ammonia (in mg N/L) (i) shall be the one (1)-hour average concentration for total ammonia, computed for a design flow specified in subsection 1105.5; and (ii) shall account for the influence of the pH as shown in Table 2e.
(b) The CMC criterion was calculated using the following formula, which shall be used to calculate unlisted values: CMC = [(0.411/(1+10^7.204-pH))] + [58.4/(1+ 10^pH-7.204)].
Table 2e. Total Ammonia(In Milligrams of Nitrogen Per Liter)
Cmc Criterion for Various Ph
| pH | CMC | pH | CMC | pH | CMC | pH | CMC |
|---|---|---|---|---|---|---|---|
| 6.50 | 48.8 | 7.20 | 29.5 | 7.90 | 10.1 | 8.60 | 2.65 |
| 6.60 | 46.8 | 7.30 | 26.2 | 8.00 | 8.40 | 8.70 | 2.20 |
| 6.70 | 44.6 | 7.40 | 23.0 | 8.10 | 6.95 | 8.80 | 1.84 |
| 6.80 | 42.0 | 7.50 | 19.9 | 8.20 | 5.72 | 8.90 | 1.56 |
| 6.90 | 39.1 | 7.60 | 17.0 | 8.30 | 4.71 | 9.00 | 1.32 |
| 7.00 | 36.1 | 7.70 | 14.4 | 8.40 | 3.88 | ||
| 7.10 | 32.8 | 7.80 | 12.1 | 8.50 | 3.20 |
Table 3: Organic Constituents Numeric Criteria
| Organic Constituenta (µg/L) | CAS Number | Class C | Class D |
|---|---|---|---|
| CCC 4-Day Avg | CMC 1-Hour Avg | 30-Day Avg | |
| Acrolein | 107028 | 3.0- | 3.0 |
| Acrylonitrile | 107131 | 700.0 | — |
| Aldrin | 309002 | 0.4 | 3.0 |
| Benzene | 71432 | 1000 | — | 16,b |
|---|---|---|---|---|
| Carbamates | — | — | — | — |
| Carbaryl (Sevin) | 63252 | 2.1 | 2.1 | — |
| Carbon Tetrachloride | 56235 | 1000 | — | 5,b |
| Chlordane | 57749 | 0.0043 | 2.4 | 0.00032,b |
| Chlorinated Benzenes (except Di) | — | 25.0 | — | — |
| Chlorobenzene | 108907 | — | — | 800 |
| 1,2-Dichlorobenzene | 95501 | 200 | — | 3,000 |
| 1,3-Dichlorobenzene | 541731 | 200 | — | 10 |
| 1,4-Dichlorobenzene | 106467 | 200 | — | 900 |
| Hexachlorobenzene | 118741 | — | — | 0.000079,b |
| Pentachlorobenzene | 608935 | — | — | 0.1 |
| 1,2,4,5-Tetrachlorobenzene | 95943 | — | — | 0.03 |
| 1,2,4-Trichlorobenzene | 120821 | — | — | 0.076 |
| Chlorinated Ethanes | — | 50 | — | — |
| 1,2-Dichloroethane | 107062 | — | — | 650,b |
| Hexachloroethane | 67721 | — | — | 0.1,b |
| 1,1,2,2-Tetrachloroethane | 79345 | — | — | 3,b |
| 1,1,1-Trichloroethane | 71556 | — | — | 200,000 |
| 1,1,2-Trichloroethane | 79005 | — | — | 8.9,b |
| Chlorinated Naphthalenes | — | — | — | — |
| 2-Chloronaphthalene | 91587 | 200 | — | 1000 |
| Chlorinated Phenols | — | — | — | — |
| 2-Chlorophenol | 95578 | 100 | — | 800 |
| 2,4-Dichlorophenol | 120832 | 200 | — | 60 |
| Pentachlorophenolc | 87865 | [I]c | [I.A]c | 0.04,b |
| 2,4,5-Trichlorophenol | 95954 | — | — | 600 |
| 2,4,6-Trichlorophenol | 88062 | — | — | 2.8,b |
| 3-Methyl-4-Chlorophenol | 59507 | — | — | 2,000 |
| Chloroalkyl Ethers | — | 1000 | — | — |
| Bis(2-Chloroethyl) Ether | 111444 | — | — | 2.2,b |
| Bis(2-Chloro-1-methylethyl) Ether | 108601 | — | — | 4,000 |
| Bis(Chloromethyl) Ether | 542881 | — | — | 0.017,b |
| Chlorophenoxy Herbicide (2,4-D) | 94757 | — | — | 12,000 |
| Chlorophenoxy Herbicide (2,4,5-TP) [Silvex] | 93721 | — | — | 400 |
| 3,3-Dichlorobenzidine | 91941 | 10 | — | 0.15,b |
| Dichloroethylenes | — | 1000 | — | — |
| 1,1-Dichloroethylene | 75354 | — | — | 20,000 |
| Trans-1,2-Dichloroethylene | 156605 | — | — | 4,000 |
| 1,2-Dichloropropane | 78875 | 2000 | — | 31,b |
| Dichloropropenes | — | 400 | — | — |
|---|---|---|---|---|
| 1,3-Dichloropropene | 542756 | — | — | 12,b |
| Dieldrin | 60571 | 0.056 | 0.24 | 0.0000012,b |
| 2,4-Dimethylphenol | 105679 | 200 | — | 3000 |
| 2,4-Dinitrotoluene | 121142 | 33 | — | 1.7,b |
| Dioxin (2,3,7,8-TCDD) | 1746016 | — | — | 0.0000000051,b |
| 1,2-Diphenylhydrazine | 122667 | 30 | — | 0.2,b |
| Endosulfan | — | 0.056 | 0.22 | 89 |
| alpha-Endosulfan | 959988 | 0.056 | 0.22 | 30 |
| beta-Endosulfan | 33213659 | 0.056 | 0.22 | 40 |
| Endosulfan Sulfate | 1031078 | — | — | 40 |
| Endrin | 72208 | 0.036 | 0.086 | 0.03 |
| Endrin Aldehyde | 7421934 | — | — | 1 |
| Ethylbenzene | 100414 | 40 | — | 130 |
| Halomethanes | — | 1000 | — | — |
| Bromoform | 75252 | — | — | 120,b |
| Chloroform | 67663 | 3000 | — | 2000 |
| Chlorodibromomethane | 124481 | — | — | 21,b |
| Dichlorobromomethane | 75274 | — | — | 27,b |
| Methyl Bromide | 74839 | — | — | 10,000 |
| Methylene Chloride | 75092 | — | — | 1,000,b |
| Heptachlor | 76448 | 0.0038 | 0.52 | 0.0000059,b |
| Heptachlor Epoxide | 1024573 | 0.0038 | 0.52 | 0.000032,b |
| Hexachlorobutadiene | 87683 | 10 | — | 0.01,b |
| Hexachlorocyclohexane (HCH)- Technical | 608731 | — | — | 0.010,b |
| alpha-Hexachlorocyclohexane (HCH) | 319846 | — | — | 0.00039,b |
| beta-Hexachlorocyclohexane (HCH) | 319857 | — | — | 0.014,b |
| gamma- Hexachlorocyclohexane (HCH) [Lindane] | 58899 | 0.08 | 0.95 | 4.4 |
| Hexachlorocyclopentadiene | 77474 | 0.5 | — | 4 |
| Isophorone | 78591 | 1000 | — | 1,800,b |
| Manganese | 7439965 | — | — | 100 |
| Methoxychlor | 72435 | 0.03 | — | 0.02 |
| Mirex | 2385855 | 0.001 | — | — |
| Naphthalene | 91203 | 600 | — | — |
| Nitrobenzene | 98953 | 1000 | — | 600 |
| Nitrophenols | — | 20 | — | — |
| 2-Methyl-4,6- Dinitrophenol | 534521 | — | — | 30 |
| 2,4-Dinitrophenol | 51285 | — | — | 300 |
|---|---|---|---|---|
| Dinitrophenols | 25550587 | — | — | 1,000 |
| Nitrosamines | — | 600 | — | 1.24,b |
| N-Nitrosodibutylamine | 924163 | — | — | 0.22b |
| N-Nitrosodiethylamine | 55185 | — | — | 1.24,b |
| N-Nitrosodimethylamine | 62759 | — | — | 3.0,b |
| N-Nitrosodi-n-Propylamine | 621647 | — | — | 0.51,b |
| N-Nitrosodiphenylamine | 86306 | — | — | 6.0,b |
| N-Nitrosopyrrolidine | 930552 | — | — | 34,b |
| Nonylphenol | 84852153 | 6.6 | 28 | — |
| Organochlorides | — | — | — | — |
| 4,4'-DDD | 72548 | 0.001 | 1.1 | 0.00012,b |
| 4,4'-DDE | 72559 | 0.001 | 1.1 | 0.000018,b |
| 4,4'-DDT | 50293 | 0.001 | 1.1 | 0.000030,b |
| Organophosphates | — | — | — | — |
| Guthion | 86500 | 0.01 | — | — |
| Malathion | 121755 | 0.1 | — | — |
| Parathion | 56382 | 0.013 | 0.065 | — |
| Phenol | 108952 | — | — | 300,000 |
| Phthalate Esters | — | 100 | — | — |
| Bis(2-Ethylhexyl) Phthalate | 117817 | — | — | 0.37,b |
| Butylbenzyl Phthalate | 85687 | — | — | 0.10,b |
| Diethyl Phthalate | 84662 | — | — | 600 |
| Dimethyl Phthalate | 131113 | — | — | 2,000 |
| Di-n-Butyl Phthalate | 84742 | — | — | 30 |
| Polychlorinated Biphenyls (PCB)d | — | 0.014 | — | 0.000064,b |
| Polynuclear aromatic hydrocarbons (PAH) | — | — | — | — |
| Acenaphthene | 83329 | 50 | — | 90 |
| Acenaphthylene | 208968 | — | — | — |
| Anthracene | 120127 | — | — | 400 |
| Benzidine | 92875 | 250 | — | 0.011,b |
| Benzo(a)anthracene | 56553 | — | — | 0.0013,b |
| Benzo(a)pyrene | 50328 | — | — | 0.00013,b |
| Benzo(b)fluoranthene | 205992 | — | — | 0.0013,b |
| Benzo(k)fluoranthene | 207089 | — | — | 0.013,b |
| Chrysene | 218019 | — | — | 0.13,b |
| Dibenzo(a,h)anthracene | 53703 | — | — | 0.00013,b |
| Fluoranthene | 206440 | 400 | — | 20 |
| Fluorene | 86737 | — | — | 70 |
| Indeno(1,2,3-cd)pyrene | 193395 | — | — | 0.0013,b |
| Pyrene | 129000 | — | — | 30 |
|---|---|---|---|---|
| Tetrachloroethylene | 127184 | 800 | — | 29,b |
| Toluene | 108883 | 600 | — | 520 |
| Toxaphene | 8001352 | 0.0002 | 0.73 | 0.00071,b |
| Tributyltin (TBT) | — | 0.072 | 0.46 | — |
| Trichloroethylene | 79016 | 1000 | — | 7,b |
| Vinyl chloride | 75014 | — | — | 1.6,b |
a For constituents with blank numeric criteria, EPA has not calculated criteria at this time. However, permit authorities will address these constituents in NPDES permit actions using the narrative criteria for toxics.
b The criteria are based on carcinogenicity of 10-6 risk level.
c The formulas for calculating the concentrations of substances indicated above are as follows:
[I] The numerical CCC for pentachlorophenol in $\mu\text{g/L}$ shall be given by:
[I.A] The numerical CMC for pentachlorophenol in $\mu\text{g/L}$ shall be given by:
d The polychlorinated biphenyls (PCB) criterion applies to total PCBs (e.g., the sum of all congener, isomer, homolog, or Aroclor analyses.)
SOURCE: Final Rulemaking published at 41 DCR 1075, 1077 (March 4, 1994); as amended by Final Rulemaking published at 47 DCR 284(January 21, 2000); as amended by Final Rulemaking published at 49 DCR 3012 (April 5, 2002); as amended by Emergency and Proposed Rulemaking published at 49 DCR 1706 (February 22, 2002); as amended by Final Rulemaking published at 52 DCR 9621(October 28, 2005); as amended by Final Rulemaking published at 57 DCR 9129, 9135-9146 (October 1, 2010); as amended by Final Rulemaking published at 60 DCR 15231 (November 1, 2013); as amended by Final Rulemaking published at 67 DCR 5371 (May 22, 2020).