North Dakota Administrative Code › Title 33 - State Department of Health › Article 33-16 - Control, Prevention, and Abatement of Pollution of Surface Water › Chapter 33-16-02.1 - Standards of Quality for Waters of the State › Table 1 - MAXIMUM LIMITS FOR SUBSTANCES IN OR CHARACTERISTICS OF CLASSES I, IA, II, AND III STREAMS

Current through Supplement No. 393, July, 2024
CAS 
							 1 No.
Substance or Characteristic
(a = aquatic life)
(b = municipal & domestic drinking
							 water)
(c = agricultural, irrigation,
							 industrial)
(d = recreation)
Maximum Limit
7429905
Aluminum (a)
Acute Standard
750 micrograms per liter
							 (µg/l)
Chronic Standard
87 µg/l
Where the pH is equal to or greater than 7.0, and the
							 hardness is equal to or greater than 50 mg/l as CaCO3 in
							 the receiving water after mixing, the 87 µg/l chronic total recoverable
							 aluminum criterion will not apply, and aluminum will be regulated based on
							 compliance with the 750 µg/l acute total recoverable aluminum
							 criterion.
7446-41-7
Ammonia (Total as N) (a)
Acute Standard
The one-hour average concentration of total ammonia
							 (expressed as N in mg/l) does not exceed, more often than once every three
							 years on the average, the numerical value given by the following
							 formula:
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							 image.
where salmonids are absent; or
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							 image.
where salmonids are present.
Chronic Standard
The 30-day average concentration of total ammonia
							 (expressed as N in mg/l) does not exceed, more often than once every three
							 years on the average, the numerical value given by the following formula; and
							 the highest 4-day average concentration of total ammonia within the 30-day
							 averaging period does not exceed 2.5 times the numerical value given by the
							 following formula:
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where CV = 2.85, when temperature (T) is <=
							 14°C; or
where:
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when T > 14°C
Site-Specific Chronic Standard
The following site-specific standard applies to the
							 Red River of the North beginning at the 12th Avenue North bridge in Fargo,
							 North Dakota, and extending approximately 32 miles downstream to its confluence
							 with the Buffalo River, Minnesota. This site-specific standard applies only
							 during the months of October, November, December, January, and February. During
							 the months of March through September, the statewide chronic ammonia standard
							 applies.
The 30-day average concentration of total ammonia
							 (expressed as N in mg/l) does not exceed, more often than once every three
							 years on the average, the numerical value given by the following formula; and
							 the highest 4-day average concentration of total ammonia within the 30-day
							 averaging period does not exceed 2.5 times the numerical value given by the
							 following formula:
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							 image
where CV = 4.63, when T <= 7° C; or
or
where:
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when T > 7°C
7440-39-3
Barium (Total) (b)
1.0 mg/l (1-day arithmetic average)
7440-42-8
Boron (Total) (c)
0.75 mg/l (30-day arithmetic average)
16887-00-6
Chloride (Total) (a, b, c)
Class I:
100 mg/l (30-day arithmetic
							 average)
Class IA:
175 mg/l (30-day arithmetic
							 average)
Class II and Class III:
250 mg/l (30-day
							 arithmetic average)
7782-50-5
Chlorine
Acute:
0.019 mg/l
Residual (Total) (a)
Chronic:
0.011 mg/l
7782-44-7
Dissolved Oxygen (a)
5 mg/l as a daily minimum (up to 10% of
							 representative samples collected during any 3-year period may be less than this
							 value provided that lethal conditions are avoided)
14797-55-8
Nitrate as N2 (a, b)
1.0 mg/l (up to 10% of samples may
							 exceed)
14797-65-0
Nitrite as N (b)
1.0 mg/l
E. coli3 (d)
Not to exceed 126 organisms per 100 ml as a geometric
							 mean of representative samples collected during any 30-day consecutive period,
							 nor shall more than 10 percent of samples collected during any 30-day
							 consecutive period individually exceed 409 organisms per 100 ml. For assessment
							 purposes, the 30-day consecutive period shall follow the calendar month. This
							 standard shall apply only during the recreation season May 1 to September
							 30.
pH (a)
Class I and IA:
7.0 - 9.0 (up to 10% of
							 representative samples collected during any 3-year period may exceed this
							 range, provided that lethal conditions are avoided).
Class II and Class III:
6.0 - 9.0 (up to
							 10% of representative samples collected during any 3-year period may exceed
							 this range, provided that lethal conditions are avoided).
108-95-2
Phenols (Total) (b)
0.3 mg/l (organoleptic criterion) (one-day arithmetic
							 average)
7440-23-5
Sodium (b, c)
Class I:
50 percent of total cations as
							 milliequivalents per liter (mEq/l)
Class IA, II, and III:
60 percent of
							 total cations as mEq/l
18785-72-3
Sulfates (Total as SO4)
							 (b)
Class I:
250 mg/l (30-day arithmetic
							 average)
Class IA and II:
450 mg/l (30-day
							 arithmetic average)
Class III:
750 mg/l (30-day arithmetic
							 average)
Sulfates (Total as SO4) (a,
							 b)
Site Specific:
750 mg/l (maximum)
							 applies to the Sheyenne River from its headwaters to 0.1 mile downstream from
							 Baldhill Dam
131.10(b) requirement:
The water quality
							 standards for the Red River and the portions of the Sheyenne River located
							 downstream from the segment of the Sheyenne River to which the site-specific
							 sulfate standard applies must continue to be maintained. The Sheyenne River
							 from 0.1 mile downstream from Baldhill Dam to the confluence with the Red River
							 shall not exceed 450 mg/l sulfate (total) 30-day arithmetic average, and the
							 Red River shall not exceed 250 mg/l sulfate (total) 30-day arithmetic average
							 after mixing downstream from the confluence of the Sheyenne River. Regulated
							 pollution control efforts must be developed to achieve compliance with these
							 water quality standards.
Temperature (a)
Eighty-five degrees Fahrenheit [29.44 degrees
							 Celsius]. The maximum increase shall not be greater than five degrees
							 Fahrenheit [2.78 degrees Celsius] above natural background
							 conditions.
Combined radium 226 and radium 228 (Total)
							 (b)
5 pCi/l (30-day arithmetic average)
Gross alpha particle activity, including radium 226,
							 but excluding radon and uranium (b)
15 pCi/l (30-day arithmetic average)
1 CAS No. is the chemical
						  abstract service registry number. The registry database contains records for
						  specific substances identified by the chemical abstract service.
2 The standard for nitrates (N)
						  is intended as benchmark concentration when stream or lake specific data is
						  insufficient to determine the concentration that will cause excessive plant
						  growth (eutrophication). However, in no case shall the concentration for
						  nitrate plus nitrite N exceed 10 mg/l for any waters used as a municipal or
						  domestic drinking water supply.
3 Where the E. Coli criteria are
						  exceeded and there are natural sources, the criteria may be considered
						  attained, provided there is reasonable basis for concluding that the indicator
						  bacteria density attributable to anthropogenic sources is consistent with the
						  level of water quality required by the criteria. This may be the situation, for
						  example, in headwater streams that are minimally affected by anthropogenic
						  activities.