
Contaminant | Range | MCL | MCLG | Most Likely Source |
PRIMARY INORGANIC CONTAMINANTS |
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Antimony (mg/L) | 0.0003-0.0007 | 0.006 | 0.006 | Erosion of naturally occurring deposits |
Arsenic (mg/L) | 0.0007-0.0012 | 0.01 | 0.01 | Erosion of natural deposits; runoff from orchards; runoff from glass and electronics production wastes |
Barium (mg/L) | 0.079-0.370 | 2 | 2 | Erosion of naturally occurring deposits |
Chromium (mg/L) | 0.0013- 0.0027 | 0.1 | 0.1 | Erosion of naturally occurring deposits |
Cyanide (mg/L) | 0.005-0.019 | 0.2 | 0.2 | Erosion of naturally occurring deposits |
Fluoride(mg/L) | 0.1-1.2 | 4 | 4 | Erosion of naturally occurring deposits |
Mercury (mg/L) | 0.0002-0.0004 | 0.002 | 0.002 | Erosion of naturally occurring deposits |
Thallium (mg/L) | 0.0009 | 0.002 | 0.0005 | Leaching from ore processing sites and discharges from electronics, glass and drug factories |
Nitrate (mg/L) | 0.2-3.6 | 10 | 10 | Runoff from fertilizer, leaching from |
Nitrite (mg/L) | 0.005-0.057 | 1 | 1 | Runoff from fertilizer, leaching from |
Total Nitrate & Nitrite (mg/L) | 0.2-3.5 | 10 | 10 | Runoff from fertilizer, leaching from |
Selenium (mg/L) | 0.0005-0.0071 | 0.05 | 0.05 | Erosion of naturally occurring deposits |
Sodium (mg/L) | 9.1-18 | NE | NE | Erosion of naturally occurring deposits |
Sulfate (mg/L) | 23-35 | 1000 | NE | Erosion of naturally occurring deposits |
Total Dissolved Solids (mg/L) | 190-229 | 2000 | NE | Soil runoff |
Turbidity (NTU) | 0.07-0.35 | 0.3-5.0 | TT | Soil runoff, MCL if 0.5 for surface water and 5.0 for groundwater |
LEAD & COPPER (Tested at customer tap) |
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Copper (mg/L) | 0.009-0.88 | AL=1.3 | 1.3 | Corrosion of household plumbing system |
Lead (mg/L) | ND-0.183 | AL=0.015 | 0 | Corrosion of household plumbing system |
SECONDARY INORGANIC CONTAMINANTS |
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Aluminum (mg/L) | ND-0.11 | 0.05-0.2 | NE | Erosion of naturally occurring deposits |
Color (CU) | 0-5 | 15 | NE | Decaying naturally occurring organic material |
Chloride (mg/L) | 14.0-27.8 | 250 | NE | Erosion of naturally occurring deposits, road de-icing |
Iron (mg/L) | 0.02-0.30 | 0.3 | NE | Erosion of naturally occurring deposits |
Manganese (mg/L) | ND-0.02 | 0.05 | NE | Erosion of naturally occurring deposits |
Odor (TON) | 0-1 | 3 | NE | Various sources |
pH (units) | 6.8-8.6 | 6.5-8.5 | NE | Naturally occurring |
Zinc (mg/L) | ND-0.01 | 5 | NE | Erosion of naturally occurring deposits |
NONREGULATED CONTAMINANTS |
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Bicarbonate (mg/L) | 112-320 | UR | NE | Naturally occurring |
Boron (mg/L) | 0.05-0.12 | UR | NE | Erosion of naturally occurring deposits |
Calcium (mg/L) | 13-179 | UR | NE | Erosion of naturally occurring deposits |
Carbon Dioxide (mg/L) | 85-230 | UR | NE | Naturally occurring |
Total Hardness (mg/L) as CaCo3 | 98-201 | UR | NE | Erosion of naturally occurring deposits |
Calcium Hardness (mg/L) | 122-164 | UR | NE | Erosion of naturally occurring deposits |
Orthophosphates (mg/L) | 0.01-0.02 | UR | NE | Erosion of naturally occurring deposits |
Phosphates (mg/L) | <0.10-<0.10 | UR | NE | Erosion of naturally occurring deposits |
Potassium (mg/L) | 1.7-15.0 | UR | NE | Erosion of naturally occurring deposits, treatment |
Strontium (mg/L) | 0.26-0.40 | UR | NE | Erosion of naturally occurring deposits |
Alkalinity (mg/L) | 126-144 | UR | NE | Erosion of naturally occurring deposits |
Magnesium (mg/L) | 5.3-54.0 | UR | NE | Erosion of naturally occurring deposits |
Metheyene Blue Active (mg/L) | 0.01-0.16 | UR | NE | Naturally occurring |
Silica (mg/L) | 6.8-55.0 | UR | NE | Erosion of naturally occurring deposits |
TSS (mg/L) | <3.0-19.0 | UR | NE | Suspended material from soil runoff |
MICROBIOLOGICAL |
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Total Coliform, colonies/100mL | 110 monthly | >5% | 0 | MCL for monthly compliance. All repeated samples were negative; no violations were issued. Human and animal fecal waste, naturally occurring in environment. |
RADIOLOGICAL |
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Alpha Emitters (pCi/L) | 8.2-15.1 | 15 pCi/L | 15 pCi/L | Erosion of naturally occurring deposits |
Beta/Photon Emitters (pCi/L) | 4.1-8.7 | 50 | NE | Erosion of naturally occurring deposits Note: The MCL for beta prticles is 4 mrem (millirems) per year. EPA considers 50 pCi/L to be the level of concern for beta particles |
Radium 228 (pCi/L)
Combined Radium 226 & 228 | 0.13-0.90 0.1-2.9 | 5 5 | NE NE | Erosion of naturaly occurring deposits Erosion of naturally occurring deposits |
Radon (pCi/L) | 6.3-2672 | NE | NE | Naturally occurring in soil |
Strontium mg/L | 0.26-0.40 | UR | NE | Erosion of naturally occurring deposits |
Strontium 90 (pCi/L) | 4.7-9 | NA | NE | Decay of natural and man-made deposits |
Tritium (pCi/L) | -180-342 | NA | NE | Decay of natural and man-made deposits |
PESTICIDE/PBB/SOC CONTAMINANTS |
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Di(2-Ethylhexyl) Adipate (ug/L) | ND-1 | 400 | 400 |
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VOLATILE ORGANIC CONTAMINANTS |
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Tetrachloroethylene (mg/L) | 0.0008 | 0.005 | 0 | Improper disposal of dry cleaning and other solvents |
REGULATED ORGANICS |
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Bromodichloromethane (ppb) | 0-2.5 | NE | NE | By-product of drinking water chlorination |
Chlorodibromomethane (ppb) | 0-0.9 | NE | NE | By-product of drinking water chlorination |
Chloroform (ppb) | 0-4.9 | NE | NE | By-product of drinking water chlorination |
DISINFECTION-BY-PRODUCTS |
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Tthm's [total Trihalomethanes] (ug/L) | 7.0-64.1 | 80 | NE | By-product of drinking water chlorination |
Chlorate (ug/L) | 43-115 | NE | NE | Treatment disinfection |
Chlorite (ug/L) | 39-283 | NE | NE | Treatment disinfection |
Total Haloacetic Acids (HAA5) (ug/L) | 11.4-53.1 | NE | NE | Treatment disinfection |
Total Haloacetic Acids (HAA6) (ug/L) | 30.5-58.0 | NE | NE | Treatment disinfection |
ORGANIC MATERIAL |
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TOC (mg/L) | 2.26-2.60 | UR | NE | Naturally occurring |
UV-254 (1/cm) | 0.013-0.087 | UR | NE | Naturally occurring |
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