Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 16 - DISINFECTANTS AND DISINFECTION BYPRODUCTS › Section 179-16-004 - ANALYTICAL REQUIREMENTS

Current through June 17, 2024
004.01 General
16-004.01A Systems must use only the
				analytical method(s) specified in
				40 CFR 141.131(a)(1)
				through (b)(1) or their equivalent as
				approved by the United States Environmental Protection Agency (EPA) to
				demonstrate compliance with the requirements of 179 NAC 16, 179 NAC 23 and 179
				NAC 24..
16-004.02B Analysis under
				179 NAC 16 for disinfection byproducts must be conducted by the Department
				Public Health Environmental Laboratory (certified by EPA) or a laboratory that
				has entered into an agreement with the Department Laboratory except as
				specified under 179 NAC 20. To receive certification to conduct analyses for
				the DBP contaminants in 179 NAC
				2-002.04E, 179 NAC
				16-008, 179 NAC 23 and 179 NAC 24 the
				laboratory must:
1. Analyze performance
				evaluation (PE) samples that are acceptable to the Department at least once
				during each consecutive 12 month period by each method for which the laboratory
				desires certification.
2. The
				laboratory must achieve quantitative results on the PE sample analyses that are
				within the following acceptance limits:
Disinfection
								Byproduct
Acceptance
limits (percent of true value)
Comments
TTHM
Chloroform
Bromodichloromethane
Dibromochloromethane
Bromoform
±20
±20
±20
±20
Laboratory must meet all 4 individual THM
								acceptance limits in order to successfully pass a PE sample for
								TTHMs
HAA5
Monochloroacetic Acid
Dichloroacetic Acid
Trichloroacetic Acid
Monobromoacetic Acid
Dibromoacetic Acid
+40
+40
+40
+40
+40
Laboratory must meet the acceptance limits for 4
								out of 5 of the HAA5 compounds in order to successfully pass a PE sample for
								HAA5
Chlorite
±30
Bromate
+30
3.
				Report quantitative data for concentrations at least as low as the ones listed
				in the following table for all DBP samples analyzed for compliance with 179 NAC
				2-002.04E, 179 NAC
				16-008, and 179 NAC 23 and 179 NAC
				24.
Disinfection Byproduct
Minimum reporting level
(mg/L) 
								1
Comments
TTHM 
								2
Chloroform
Bromodichloromethane
Dibromochloromethane
Bromoform
0.0010
0.0010
0.0010
0.0010
HAA5 
								2
Monochloroacetic Acid
Dichloroacetic Acid
Trichloroacetic Acid
Monobromoacetic Acid
Dibromoacetic Acid
0.0020
0.0010
0.0010
0.0010
0.0010
Chlorite
Bromate
0.020
0.0050 or 0.0010
Applicable to monitoring as prescribed in 179 NAC
								16-005.02 items 2.a(2) and 2.b.
Laboratories that use EPA Methods 317.0 Revision
								2.0, 326.0 or 321.8 must meet a 0.0010 mg/L MRL for bromate.
1 The calibration curve must
				  encompass the regulatory minimum reporting level (MRL) concentration. Data may
				  be reported for concentrations lower than the regulatory MRL as long as the
				  precision and accuracy criteria are met by analyzing an MRL check standard at
				  the lowest reporting limit chosen by the laboratory. The laboratory must verify
				  the accuracy of the calibration curve at the MRL concentration by analyzing an
				  MRL check standard with a concentration less than or equal to 110% of the MRL
				  with each batch of samples. The measured concentration for the MRL check
				  standard must be ±50% of the expected value, if any field sample in the
				  batch has a concentration less than 5 times the regulatory MRL. Method
				  requirements to analyze higher concentration check standards and meet tighter
				  acceptance criteria for them must be met in addition to the MRL check standard
				  requirement.
2 When adding the individual
				  trihalomethane or haloacetic acid concentrations to calculate the TTHM or HAA5
				  concentrations, respectively, a zero is used for any analytical result that is
				  less than the MRL concentration for that DBP, unless otherwise specified by the
				  Department.
16-004.02C A Grade I, II, III, or IV licensed
				water operator or a person who has been trained to take the samples must
				measure daily chlorite samples at the entrance to the distribution system. If a
				licensed operator does not take the sample, Attachment 3, which is incorporated
				herein by reference must be completed and sent to the Department.