| EPA Method | Test Name | Matrix | MRL | Instrument |
|---|
| SM 2340 B | Hardness by ICP-AES Calculation 20th Ed. | Drinking Water | - | Calculator |
| SM 2340 B | Hardness by ICP-AES Calculation 20th Ed. | Liquid | - | Calculator |
| SM 2340 C | Hardness, Total EDTA Titration, 20th ed | Drinking Water | 2 | Buret |
| SM 2340 C | Hardness, Total EDTA Titration, 20th ed | Liquid | 2 | Buret |