Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 611 - PRIMARY DRINKING WATER STANDARDS
Subpart N - INORGANIC MONITORING AND ANALYTICAL REQUIREMENTS
Section 611.600 - Applicability
Current through Register Vol. 48, No. 38, September 20, 2024
Certain suppliers must monitor to determine compliance with the State-only MCLs in Section 611.300 and the revised MCLs in 611.301, as appropriate, as this Subpart N requires:
a) CWS suppliers.
b) NTNCWS suppliers.
c) Transient non-CWS suppliers to determine compliance with the nitrate and nitrite MCLs.
d) Detection Limits. Specific detection limits apply for this Subpart N (this list includes MCLs from Section 611.301 are for information purposes only):
|
Contaminant |
MCL (mg/L, except asbestos) |
Method |
Detection Limit (mg/L) |
|
|
Antimony |
0.006 |
Atomic absorption - furnace technique |
0.003 |
|
|
Atomic absorption - furnace technique (stabilized temperature) |
0.00085 |
|||
|
Inductively coupled plasma-mass spectrometry |
0.0004 |
|||
|
Atomic absorption - gaseous hydride technique |
0.001 |
|||
|
Arsenic |
0.010 |
Atomic absorption - furnace technique |
0.001 |
|
|
Atomic absorption - furnace technique (stabilized temperature) |
0.000056 |
|||
|
Atomic absorption - gaseous hydride technique |
0.001 |
|||
|
Inductively coupled plasma-mass spectrometry |
0.00147 |
|||
|
Asbestos |
7 MFL1 |
Transmission electron microscopy |
0.01 MFL |
|
|
Barium |
2 |
Atomic absorption - furnace technique |
0.002 |
|
|
Atomic absorption - direct aspiration technique |
0.1 |
|||
|
Inductively coupled plasma arc furnace |
0.002 |
|||
|
Inductively coupled plasma |
0.001 |
|||
|
Beryllium |
0.004 |
Atomic absorption - furnace technique |
0.0002 |
|
|
Atomic absorption - furnace technique (stabilized temperature) |
0.000025 |
|||
|
Inductively coupled plasma2 |
0.0003 |
|||
|
Inductively coupled plasma-mass spectrometry |
0.0003 |
|||
|
Cadmium |
0.005 |
Atomic absorption - furnace technique |
0.0001 |
|
|
Inductively coupled plasma |
0.001 |
|||
|
Chromium |
0.1 |
Atomic absorption - furnace technique |
0.001 |
|
|
Inductively coupled plasma |
0.007 |
|||
|
Inductively coupled plasma |
0.001 |
|||
|
Cyanide |
0.2 |
Distillation, spectrophotometric3 |
0.02 |
|
|
Automated distillation, spectrophotometric3 |
0.005 |
|||
|
Distillation, selective electrode3 |
0.05 |
|||
|
Distillation, amenable, spectrophotometric4 |
0.02 |
|||
|
UV, distillation, spectrophotometric8 |
0.0005 |
|||
|
Micro distillation, flow injection, spectrophotometric3 |
0.0006 |
|||
|
Ligand exchange with amperometry4 |
0.0005 |
|||
|
Mercury |
0.002 |
Manual cold vapor technique |
0.0002 |
|
|
Automated cold vapor technique |
0.0002 |
|||
|
Nickel |
No MCL |
Atomic absorption - furnace technique |
0.001 |
|
|
Atomic absorption - furnace technique (stabilized temperature) |
0.00065 |
|||
|
Inductively coupled plasma2 |
0.005 |
|||
|
Inductively coupled plasma-mass spectrometry |
0.0005 |
|||
|
Nitrate (as N) |
10 |
Manual cadmium reduction |
0.01 |
|
|
Automated hydrazine reduction |
0.01 |
|||
|
Automated cadmium reduction |
0.05 |
|||
|
Ion-selective electrode |
1 |
|||
|
Ion chromatography |
0.01 |
|||
|
Capillary ion electrophoresis |
0.076 |
|||
|
Nitrite (as N) |
1 |
Spectrophotometric |
0.01 |
|
|
Automated cadmium reduction |
0.05 |
|||
|
Manual cadmium reduction |
0.01 |
|||
|
Ion chromatography |
0.004 |
|||
|
Capillary ion electrophoresis |
0.103 |
|||
|
Selenium |
0.05 |
Atomic absorption - furnace technique |
0.002 |
|
|
Atomic absorption - gaseous hydride technique |
0.002 |
|||
|
Thallium |
0.002 |
Atomic absorption - furnace technique |
0.001 |
|
|
Atomic absorption - furnace technique (stabilized temperature) |
0.00075 |
|||
|
Inductively coupled plasma-mass spectrometry |
0.0003 |
|||
|
Footnotes. |
||||
|
1 |
"MFL" means millions of fibers per liter less than 10 µm. |
|||
|
2 |
Using a 2x preconcentration step as noted in USEPA 200.7(94). Lower MDLs are possible when using a 4x preconcentration. |
|||
|
3 |
Screening method for total cyanides. |
|||
|
4 |
Measures "free" cyanides when omitting distillation, digestion, or ligand exchange. |
|||
|
5 |
Lower MDLs are possible using stabilized temperature graphite furnace atomic absorption. |
|||
|
6 |
The MDL for USEPA 200.9(94) (atomic absorption-platform furnace (stabilized temperature)) possible using a 2x concentration step during sample digestion. The MDL using direct analyses (i.e., no sample digestion) is higher. Using multiple depositions, USEPA 200.9(94) can obtain an MDL of 0.0001 mg/L. |
|||
|
7 |
Using selective ion monitoring, USEPA 200.8(94) (ICP-MS) is capable of obtaining an MDL of 0.0001 mg/L. |
|||
|
8 |
Measures total cyanides when using UV-digestor, and "free" cyanides when bypassing UV-digestor. |
|||
BOARD NOTE: Subsections (a) through (c) derive from 40 CFR 141.23 preamble, and subsection (d) derives from 40 CFR 141.23 (a)(4)(i) and appendix A to subpart C of 40 CFR 141. See the Board Note at Section 611.301(b) relating to the MCL for nickel.
