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Water Contaminants


The environmental chemistry section tests for the following contaminants in public drinking water sources:

Metals


Parameter MCL/[SMCL]
Antimony 0.006
Arsenic 0.01
Barium 2.0
Beryllium 0.004
Cadmium 0.005
Calcium Hardness -
Chromium 0.1
Copper 1.3/[1.0]
Iron [0.3]
Lead 0.015
Manganese [0.05]
Mercury 0.002
Selenium 0.05
Silver [0.10]
Sodium 20 (Recommended level)
Thallium 0.002
Zinc [5.0]

Volatile Organic Compounds (VOCs)



Parameter MCL/[SMCL]
Trihalomethanes (total) 0.080
Benzene 0.005
Carbon tetrachloride 0.005
Chlorobenzene 0.01
p-Dichlorobenzene 0.075; [0.005]
o-Dichlorobenzene 0.6
1,2-Dichloroethane 0.0005
1,1-Dichloroethylene 0.007
c-1,2 Dichloroethylene 0.07
t-1,2-Dichloroethylene 0.1
Dichloromethane 0.005
1,2-Dichloropropane 0.005
Ethylbenzene 0.7
Styrene 0.01
Tetrachloroethylene 0.005
Toluene 1
1,2,4-Trichlorobenzene 0.07
1,1,1-Trichloroethane 0.2
1,1,2-Trichloroethane 0.005
Trichloroethylene 0.005
Vinyl chloride 0.002
As well as over 40 unregulated VOCs -

Inorganic Compounds



Parameter MCL/[SMCL]
Alkalinity -
Chloride [250]
Cyanide 0.2
Fluoride 1.8(state); [2.0]
Nitrate (as N) 10
Nitrite (as N) 1
pH 6.5-8.5
Solids (TDS) [500]
Sulfate Deferred; [250]

The Environmental Chemistry section performs tests for the following contaminants in private well water sources:

  • Alkalinity
  • Nitrite
  • pH
  • Sulfate
  • Chloride
  • Calcium hardness
  • Fluoride
  • Iron
  • Nitrate
  • Sodium

Water Microbiology tests for the following contaminants in public and private drinking water sources:

  • E.coli
  • Total coliforms

Return to the Environmental Chemistry section page.

Return to the Delaware Public Health Laboratory home page.



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