Appendix A - Ammonia Toxicity Standards for Fresh and Marine Waters
Water Quality Criteria for Ammonia in Freshwater (ACUTE)
One-Hour Average Concentration
|
Total Ammonia (mg/liter NH3) |
|||
|
pH |
20C |
25C |
30C |
|
6.50 |
29 |
29 |
20 |
|
6.75 |
27 |
26 |
18.6 |
|
7.00 |
23 |
23 |
16.4 |
|
7.25 |
19.2 |
19.0 |
13.5 |
|
7.50 |
14.6 |
14.5 |
10.3 |
|
7.75 |
10.3 |
10.2 |
7.3 |
|
8.00 |
6.8 |
6.8 |
4.9 |
|
8.25 |
3.9 |
4.0 |
2.9 |
|
8.50 |
2.3 |
2.4 |
1.81 |
|
8.75 |
1.42 |
1.52 |
1.18 |
|
9.00 |
0.91 |
1.01 |
0.82 |
*To convert these values to mg/liter N, multiply by 0.822.
Ambient Water Quality for Ammonia -1984, EPA 440/5-85-001, January 1985.
Water Quality Criteria for Amonia in Freshwater (CHRONIC)
Four-Day Average Concentration
|
Total Ammonia (mg/liter NH3) |
|||
|
pH |
20C |
25C |
30C |
|
6.50 |
2.5 |
1.73 |
1.23 |
|
6.75 |
2.5 |
1.74 |
1.23 |
|
7.00 |
2.5 |
1.74 |
1.23 |
|
7.25 |
2.5 |
1.75 |
1.24 |
|
7.50 |
2.5 |
1.76 |
1.25 |
|
7.75 |
2.3 |
1.65 |
1.18 |
|
8.00 |
1.55 |
1.10 |
0.79 |
|
8.25 |
0.90 |
0.64 |
0.47 |
|
8.50 |
0.53 |
0.39 |
0.29 |
|
8.75 |
0.32 |
0.24 |
0.190 |
|
9.00 |
0.21 |
0.163 |
0.133 |
* To convert these values to mg/liter N, multiply by 0.822.
Ambient Water Quality for Ammonia -1984, EPA 440/5-85-001, January 1985 as amended by memorandum "Revised Tables for Determining Average Freshwater Ammonia Concentrations," July 30, 1992.
Water Quality Criteria for Ammonia in Saltwater (ACUTE)
One-Hour Average Concentration
|
Total Ammonia (mg/liter NH3) |
|||
|
Salinity = 30 g/kg |
|||
|
pH |
25C |
30C |
35C |
|
7.8 |
7.9 |
5.4 |
3.7 |
|
8.0 |
5.0 |
3.5 |
2.5 |
|
8.2 |
3.3 |
2.3 |
1.7 |
|
8.4 |
2.1 |
1.6 |
1.1 |
|
8.6 |
1.4 |
1.1 |
0.81 |
*To convert these values to mg/liter N, multiply by 0.822.
Ambient Water Quality Criteria for Ammonia (Saltwater)-1989, EPA 440/5-88-044, April 1989.
Water Quality Criteria for Amonia in Saltware (CHRONIC)
Four-Day Average Concentration
|
Total Ammonia (mg/liter NH3) |
|||
|
Salinity = 30 g/kg |
|||
|
pH |
25C |
30C |
35C |
|
7.8 |
1.2 |
0.81 |
0.56 |
|
8.0 |
0.75 |
0.53 |
0.37 |
|
8.2 |
0.50 |
0.34 |
0.25 |
|
8.4 |
0.31 |
0.23 |
0.17 |
|
8.6 |
0.22 |
0.16 |
0.12 |
* To convert these values to mg/liter N, multiply by 0.822.
Ambient Water Quality Criteria for Ammonia (Saltwater)-1989, EPA 440/5-88-044, April 1989.
