PARAMETER | LIMITS | FREQUENCY |
Resistivity | >0.5 megaohms/cm | Monthly |
Pb, Cd, Cr, Cu, Ni, Zn | <0.05 mg/L per contaminant, and <0.1 mg/L total | Annually |
Total chlorine residual | Non-detectable | Monthly |
Heterotrophic plate count | <500 CFU/mL | Monthly |
Bacteriological quality of reagent water | Ratio of growth rate: 0.8 to 3.0 (See Standard Methods, Section 9020B. This test is not required if marijuana testing facilities use water that meets the criteria for Types I and II water as defined in Standard Methods Section 1080). | Annually |
4 Del. Admin. Code § 5001-6.0