Indiana Administrative Code
Title 327 - WATER POLLUTION CONTROL DIVISION
Article 2 - WATER QUALITY STANDARDS
Rule 1 - Water Quality Standards Applicable to All State Waters Except Waters of the State Within the Great Lakes System
Section 1-6 - Minimum surface water quality criteria

(A) Settle to form putrescent or otherwise objectionable deposits.

(B) Occur in amounts sufficient to be unsightly or deleterious.

(C) Produce:

(D) Occur in concentrations or combinations that will cause or contribute to the growth of aquatic plants or algae to a degree as to:

(E) Occur in amounts sufficient to be acutely toxic to, or to otherwise severely injure or kill, aquatic life, other animals, plants, or humans. To ensure protection of aquatic life, concentrations of toxic substances must not exceed the final acute value (FAV = 2 (AAC)) in the undiluted discharge or the acute aquatic criterion (AAC) outside the zone of initial dilution or, if applicable, the zone of discharge-induced mixing. The following apply where applicable:

(F) Clause (E) does not apply to the chemical control of plants and animals when that control is performed in compliance with approval conditions specified by the Indiana department of natural resources as provided by IC 14-22-9.

(A) A toxic substance or pollutant must not be present in surface waters outside of mixing zones in concentrations that exceed the most stringent of the following continuous criterion concentrations (CCCs):

(B) For certain substances, one (1) or more of the CCCs identified in clause (A) are specified in:

(C) Criterion or criteria may be calculated by the commissioner using the corresponding procedures prescribed by sections 8.3 through 8.6 of this rule for substances for which a CCC identified in clause (A) is not specified in:

(D) A CCC determined under clause (B)(i), (B)(iv), (B)(v), or (C) may be modified on a site-specific basis to reflect local conditions in accordance with section 8.9 of this rule.

(E) The CAC and TLSC for a substance apply in all surface waters outside of a mixing zone for a discharge of that substance.

(F) In surface waters where a public water system intake is not present or is unaffected by the discharge of a substance, the HLSC and the carcinogenic criterion for that substance based on consumption of organisms from the waterbody and only incidental ingestion of water apply to all surface waters outside of the mixing zone for a discharge of that substance. (G) In surface waters where a public water system intake is present, the HLSC and the carcinogenic criterion for a substance based on consumption of organisms and potable water from the waterbody apply at the point of the public water system intake.

(A) The surface water quality criterion for selenium, except for waters where the department has made, and U.S. EPA has approved, a site-specific determination that the criterion in Table 6-1b are applicable, is as follows:

Table 6-1a

Surface Water Quality Aquatic Life Criterion for Selenium (CAS # 7782492)

[1]Fish tissue elements are expressed as steady-state; the aquatic system should not be experiencing new or increasing inputs of selenium.

[2]Egg or ovary supersedes any whole-body, muscle, or water column element when fish egg or ovary concentrations are measured. Any proposal to sample egg or ovary fish tissue must be submitted to the department for review and approval prior to initiation of sampling, and the department will evaluate all representative egg or ovary fish tissue data to determine compliance with this criterion element.

[3]Fish whole-body or muscle tissue supersedes the water column element when both fish tissue and water concentrations are measured. Any proposal to sample fish whole-body or muscle tissue must be submitted to the department for review and approval prior to initiation of sampling, and the department will evaluate all representative fish whole-body or muscle tissue data to determine compliance with this criterion element.

[4]Fish tissue data provide instantaneous point measurements that reflect integrative accumulation of selenium over time and space in fish populations at a given site.

[5]Water column values are the applicable criterion element in the absence of steady-state condition fish tissue data and for fishless waters. Water column values are based on dissolved total selenium in water and are derived from fish tissue values via bioaccumulation modeling. Instead of the requirements in 327 IAC 5-2-11.1(b)(2), the allowable mixing zone dilution will be determined by applying the guideline in 327 IAC 2-1-4 to the thirty (30) day, ten (10) year (Q30,10) low flow of the receiving stream for the chronic aquatic criterion (CAC) water column criterion element applicable to lotic aquatic systems, in the absence of sitespecific mixing zone data.

[6]Intermittent Exposure Equation variables mean the following:

WQCint is the water column intermittent element.

WQC30-day is the water column monthly element for either lentic or lotic waters.

Cbkgrnd is the average background selenium concentration.

fint is the fraction of any 30-day period during which elevated selenium concentrations occur, with fint assigned a value $0.033 (corresponding to one (1) day).

[7]The water column criterion element may be modified on a site-specific basis in accordance with clause (C).

(B) The surface water quality criterion for selenium, where the department has made, and U.S. EPA has approved, a site-specific determination that fishes in the Order Acipenseriformes (Order includes sturgeon and paddlefish) do not occur at the site, is as follows:

Table 6-1b

Site-specific Surface Water Quality Aquatic Life Criterion for Selenium (CAS # 7782492) in Non-Acipenseriformes (No Sturgeon or Paddlefish) Waters[1]

[1]This criterion is applicable to surface waters for which the department has made, and U.S. EPA has approved, a site-specific determination that fishes in the Order Acipenseriformes do not occur at the site. In making this determination, the department must comply with the procedures in clause (D).

[2]Fish tissue elements are expressed as steady-state; the aquatic system should not be experiencing new or increasing inputs of selenium.

[3]Egg or ovary supersedes any whole-body, muscle, or water column element when fish egg or ovary concentrations are measured. Any proposal to sample egg or ovary fish tissue must be submitted to the department for review and approval prior to initiation of sampling, and the department will evaluate all representative egg or ovary fish tissue data to determine compliance with this criterion element.

[4]Fish whole-body or muscle tissue supersedes the water column element when both fish tissue and water concentrations are measured. Any proposal to sample fish whole-body or muscle tissue must be submitted to the department for review and approval prior to initiation of sampling, and the department will evaluate all representative fish whole-body or muscle tissue data to determine compliance with this criterion element.

[5]Fish tissue data provide instantaneous point measurements that reflect integrative accumulation of selenium over time and space in fish populations at a given site.

[6]Water column values are the applicable criterion element in the absence of steady-state condition fish tissue data and for fishless waters. Water column values are based on dissolved total selenium in water and are derived from fish tissue values via bioaccumulation modeling. Instead of the requirements in 327 IAC 5-2-11.1(b)(2), the allowable mixing zone dilution will be determined by applying the guideline in 327 IAC 2-1-4 to the thirty (30) day, ten (10) year (Q30,10) low flow of the receiving stream for the chronic aquatic criterion (CAC) water column criterion element applicable to lotic aquatic systems, in the absence of sitespecific mixing zone data.

[7]Intermittent Exposure Equation variables mean the following:

WQCint is the water column intermittent element.

WQC30-day is the water column monthly element for either lentic or lotic waters.

Cbkgrnd is the average background selenium concentration.

fint is the fraction of any 30-day period during which elevated selenium concentrations occur, with fint assigned a value $0.033 (corresponding to one (1) day).

[8]The water column criterion element may be modified on a site-specific basis in accordance with clause (C).

(C) Modification of the selenium water column criterion element must be achieved according to the following:

(D) Upon receipt of an application for a site-specific determination that fishes in the Order Acipenseriformes (Order includes sturgeon and paddlefish) do not occur at the site, the department shall do the following:

(A) The AAC for chloride as a function of hardness (in mg/l as CaCO3) and sulfate (in mg/l) in surface waters is calculated using the following formula:

C = 287.8 (hardness)0.205797 (sulfate)-0.07452

Where: C = chloride AAC (maximum) in mg/l.

(B) The CAC for chloride as a function of hardness (in mg/l as CaCO3) and sulfate (in mg/l) in surface waters is calculated using the following formula:

C = 177.87 (hardness)0.205797 (sulfate)-0.07452

Where: C = chloride CAC (4-day average) in mg/l.

(C) This clause applies to the AAC and CAC for chloride provided in this subdivision, as follows:

(D) The AAC for chloride in mg/l at selected concentrations of hardness (in mg/l as CaCO3) and sulfate is as follows:

Table 6-3a[1]Hardness (mg/l)

[1] The equation in clause (A) must be used instead of the criteria in this table when chloride criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(E) The CAC for chloride in mg/l at selected concentrations of hardness (in mg/l as CaCO3) and sulfate is as follows:

Table 6-3b[1] Hardness (mg/l)

[1] The equation in clause (B) must be used instead of the criteria in this table when chloride criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(A) The surface water quality criteria for sulfate in mg/l for the specified ranges of hardness (in mg/l as CaCO3) or chloride (in mg/l), or both, are as follows:

(B) This clause applies to the surface water quality criteria for sulfate provided in clause (A), as follows:

(C) The surface water quality criteria for sulfate in mg/l at selected concentrations of hardness (in mg/l as CaCO3) and chloride are as follows:

Table 6-5[1]

Hardness (mg/l)

[1]The equations in clause (A) must be used instead of the criteria in this table when sulfate criteria are used as intermediate values in a calculation, such as in the calculation of WQBELs.

(A) imparts unpalatable flavor to food fish; or

(B) results in offensive odors in the vicinity of the water.

(A) exceed pH nine (9.0); and

(B) are correlated with photosynthetic activity.

(A) average at least five (5.0) milligrams per liter per calendar day; and

(B) not be less than four (4.0) milligrams per liter at any time.

(A) Abnormal temperature changes that may adversely affect aquatic life are prohibited unless caused by natural conditions.

(B) The normal daily and seasonal temperature fluctuations that existed before the addition of heat due to other than natural causes must be maintained.

(C) The maximum temperature rise at any time or place above natural temperatures must not exceed:

(D) Water temperatures must not exceed the maximum limits in the following table:

(A) Except for waters covered in clause (B), surface waters outside of mixing zones must be free of substances in concentrations that, on the basis of available scientific data, are believed to be sufficient to injure, be chronically toxic to, or be carcinogenic, mutagenic, or teratogenic to:

(B) For waters listed in subsection (c), the following ammonia criteria apply outside of a mixing zone:

Table 6-7

Maximum Ammonia Concentrations (Unionized Ammonia as N)***

(mg/l) Temperature (EC)

***To calculate total ammonia, divide the number in this table by the value determined by: 1/(10pK a -pH + 1). Where: pKa = 0.09018 + (2729.92/(T + 273.2))

pH = pH of water

T = °C

Table 6-8

24-Hour Average Ammonia Concentrations (Unionized Ammonia as N)***

(mg/l) Temperature (°C)

***To calculate total ammonia, divide the number in this table by the value determined by: 1/(10pK a -pH + 1).

Where: pKa = 0.09018 + (2729.92/(T + 273.2))

pH = pH of water

T = °C

(A) six (6.0) milligrams per liter at any time; and

(B) seven (7.0) milligrams per liter in areas where spawning occurs during the spawning season and in areas used for imprinting during the time salmonids are being imprinted.

(A) Seventy (70) degrees Fahrenheit (twenty-one and one-tenth (21.1) degrees Celsius) at any time.

(B) Sixty-five (65) degrees Fahrenheit (eighteen and three-tenths (18.3) degrees Celsius) during spawning and imprinting periods.

(A) Evaluate waters for full body contact recreational uses.

(B) Establish wastewater treatment requirements.

(C) Establish effluent limits during the recreational season.

(A) One hundred twenty-five (125) colony forming units (cfu) or most probable number (MPN) per one hundred (100) milliliters as a geometric mean based on not less than five (5) samples equally spaced over a thirty (30) day period.

(B) Two hundred thirty-five (235) cfu or MPN per one hundred (100) milliliters in any one (1) sample in a thirty (30) day period, except that, in cases where there are at least ten (10) samples at a given site, up to ten percent (10%) of the samples may exceed two hundred thirty-five (235) cfu or MPN per one hundred (100) milliliters where the:

(A) The concentration of E. coli in the undiluted discharge does not exceed one hundred twenty-five (125) cfu or MPN per one hundred (100) milliliters as a geometric mean of the effluent samples taken in a calendar month.

(B) Not more than ten percent (10%) of all samples when not less than ten (10) samples are taken and analyzed for E. coli in a calendar month exceed two hundred thirty-five (235) cfu or MPN per one hundred (100) milliliters as a daily maximum. Under this clause, the calculation of ten percent (10%) of the samples taken must be limited to the lowest whole number result.

(A) The concentration of E. coli in the undiluted discharge must not exceed one hundred twenty-five (125) cfu or MPN per one hundred (100) milliliters as a geometric mean of the effluent samples taken in a calendar month.

(B) Not more than ten percent (10%) of all samples in a calendar month exceed two hundred thirty-five (235) cfu or MPN per one hundred (100) milliliters as a daily maximum. Under this clause, the calculation of ten percent (10%) of the samples taken must be limited to the lowest whole number result.

(A) Five thousand (5,000) cfu or MPN per one hundred (100) milliliters as a monthly average value (either MPN or membrane filter (MF) count).

(B) Five thousand (5,000) cfu or MPN per one hundred (100) milliliters in more than twenty percent (20%) of the samples examined during any month.

(C) Twenty thousand (20,000) cfu or MPN per one hundred (100) milliliters in more than five percent (5%) of the samples examined during any month.

(A) Coagulation.

(B) Sedimentation.

(C) Filtration.

(D) Disinfection.

(A) combined concentration of nitrate-N and nitrite-N must not exceed ten (10) milligrams per liter as a thirty (30) day average value; and

(B) concentration of nitrite-N must not exceed one (1) milligram per liter as a thirty (30) day average value.