Humboldt Bay Municipal Water District
Testing:
McKinleyville Community Services District
2006 Consumer Confidence
Report
Contaminant and Units |
Level Detected |
MCL |
PHG (or MCLG) |
Likely Source and Potential Effects (if above MCL) |
|
Microbiological Contaminants |
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|
Total Coliform Bacteria |
Zero positive |
More than one positive sample monthly |
Zero positives |
Coliform bacteria naturally present in the environment and are used as an indicator that other potentially-harmful, bacteria may be present |
|
Fecal Coliform and E. coli. |
Zero positive |
A routine sample and a repeat sample are total coliform positive, and one is also fecal coliform positive |
Zero positive |
Fecal coliform and E. coli. are bacteria whose presents indicates that water may be contaminated with human or animal fecal waste |
|
Disinfection Byproducts and Disinfectant Residuals |
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|
TTHMs – Total Trihalomethanes (ppb) |
Average = 6.0 |
80 mg/L |
n/a |
By-product of drinking water chlorination |
|
HAA5 (ppb) Halo acetic Acids |
Average = 2.4 |
60 mg/L |
n/a |
By-product of drinking water chlorination |
|
Chlorine (ppm) |
Average= 0.65 |
4 mg/L |
4 |
Drinking water disinfection |
|
Inorganic Contaminants |
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|
Copper (ppm)*** |
Five sites tested and none were above the AL; 90th percentile= .665 |
AL = 1.3 mg/L |
0.17 |
Internal corrosion of household plumbing; erosion of natural deposits; leaching from wood preservatives |
|
Lead (ppb)*** |
Five sites tested none above the AL 90th percentile= ND |
AL = 15 mg/L |
2 |
Internal corrosion of household plumbing systems; discharges from industrial manufactures, erosion of natural deposits |
|
Aluminum (mg/L) |
0.16 |
0.2 mg/L |
N/a |
Discharges from industrial manufactures, erosion of natural deposits |
|
Regulated Contaminants with Secondary MCLs (as defined above, secondary MCLs address aesthetic quality of the water such as odor, taste, and appearance) |
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|
Chloride (ppm) * |
Range = 3.0 – 3.0 Average = 3.0 |
500 mg/L |
n/a |
Runoff/leaching from natural deposits, or seawater influence |
|
Sulfate (ppm) * |
Range = 10.2 – 10.2 Average = 10.2 |
500 mg/L |
n/a |
Runoff/leaching from natural deposits; industrial wastes |
|
Specific Conductance (micromhos)** |
Range = 169 – 188 Average 178.5 |
1600 mmho/cm |
n/a |
Substances form ions in water |
|
Total Dissolved Solids (ppm) * |
Detected Level = 96-98 Average = 97 |
1000 mg/L |
n/a |
Runoff/leaching from natural deposits |
|
Turbidity (NTU) |
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