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2007 Water Report |
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Jonesboro City Water & Light routinely monitors for constituents in your drinking water according to Federal and State laws. The test results table shows the results of our monitoring for the period of January 1st to December 31st, 2007. In the table you might find terms and abbreviations you are not familiar with. To help you better understand these terms we've provided the following definitions:
Parts per million (ppm) – a unit of measurement for detected levels of contaminants in drinking water. One part per million corresponds to one minute in two years or a single penny in $10,000.
Parts per billion (ppb) - a unit of measurement for detected levels of contaminants in drinking water. One part per billion corresponds to one minute in 2,000 years, or a single penny in $10,000,000.
Action Level - the concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
Maximum Contaminant Level (MCL) - the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
Maximum Contaminant Level Goal (MCLG) – unenforceable public health goal; the level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety.
Maximum Residual Disinfectant Level (MRDL) - the highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
Maximum Residual Disinfectant Level Goal (MRDLG) - the level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
NA – Not applicable
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TEST RESULTS
MICROBIOLOGICAL CONTAMINANTS
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| Contaminant |
Violation
Y/N |
Level Detected |
Unit |
MCLG
(Public Health Goal) |
MCL
(Allowable Level) |
Major Sources in Drinking Water |
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Total Coliform Bacteria
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N |
1.4% of July, 2007 samples were positive |
Present |
0 |
presence of coliform bacteria in 5% of monthly samples |
Naturally present in the environment |
| 1.4% of September, 2007 samples were positive |
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INORGANIC CONTAMINANTS
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| Contaminant |
Violation
Y/N |
Level Detected |
Unit |
MCLG
(Public Health Goal) |
MCL
(Allowable Level) |
Major Sources in Drinking Water |
Fluoride
(Water Plant 1) |
N |
Average: 0.81
Range: 0.72 – 0.91 |
ppm |
4 |
4 |
Erosion of natural deposits; water additive which promotes strong teeth |
Fluoride
(Water Plant 2) |
N |
Average: 0.80
Range: 0.69 – 0.90 |
Fluoride
(Water Plant 3) |
N |
Average: 0.85
Range: 0.74 – 0.95 |
Fluoride
(Water Plant 4) |
N |
Average: 0.80
Range: 0.70 – 0.87 |
Nitrate [as Nitrogen]
(Water Plant 1) |
N |
Average: 0.47
Range: 0.38 – 0.55 |
ppm |
10 |
10 |
Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits |
Nitrate [as Nitrogen]
(Water Plant 2) |
N |
Average: 2.12
Range: 1.50 – 2.74 |
Nitrate [as Nitrogen]
(Water Plant 3) |
N |
Average: 1.33
Range: 1.32 – 1.34 |
Nitrate [as Nitrogen]
(Water Plant 4) |
N |
Average: 0.14
Range: 0 – 0.28 |
Nitrate [as Nitrogen]
(Water Plant 5) |
N |
0.34 |
Nitrate [as Nitrogen]
(Water Plant 6) |
N |
Average: 0.95
Range: 0.91 – 0.99 |
Nitrate [as Nitrogen]
(Water Plant 7) |
N |
0.24 |
Nitrate [as Nitrogen]
(Water Plant 8) |
N |
0.19 |
Nitrate [as Nitrogen]
(Water Plant 9) |
N |
Average: 0.38
Range: 0 – 0.75 |
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VOLATILE ORGANIC CONTAMINANTS
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| Contaminant |
Violation
Y/N |
Level Detected |
Unit |
MCLG
(Public Health Goal) |
MCL
(Allowable Level) |
Major Sources in Drinking Water |
Ethylbenzene
(Water Plant 9) |
N |
Average: 0.14
Range: 0 – 0.55 |
ppb |
700 |
700 |
Discharge from petroleum refineries |
Trichloroethene
(Water Plant 2) |
N |
0.80 |
ppb |
0 |
5 |
Discharge from metal degreasing sites and other factories |
Xylenes
(Water Plant 9) |
N |
Average: 1.92
Range: 0 – 4.44 |
ppb |
10,000 |
10,000 |
Discharge from petroleum factories; discharge from chemical factories |
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LEAD AND COPPER TAP MONITORING
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| Contaminant |
Number of Sites over Action Level |
90th Percentile
Result |
Unit |
Action Level
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Major Sources in Drinking Water |
| Lead (Customers’ taps) |
0 |
<0.003 |
ppm |
0.015 |
Corrosion from household plumbing systems; erosion of natural deposits |
| Copper (Customers’ taps) |
0 |
<0.20 |
ppm |
1.3 |
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BY-PRODUCTS OF DRINKING WATER DISINFECTION
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| Contaminant |
Violation
Y/N |
Level Detected |
Unit |
MCLG
(Public Health Goal) |
MCL
(Allowable Level) |
HAA5 [Haloacetic Acids]
(Distribution system) |
N |
Highest Running 12 Month Average: 1
Range: 0 – 3.5 |
ppb |
0 |
60 |
TTHM [Total Trihalomethanes]
(Distribution system) |
N |
Highest Running 12 Month Average: 8
Range: 0 – 20.2 |
ppb |
NA |
80 |
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UNREGULATED CONTAMINANTS
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| Contaminant |
Level Detected |
Unit |
MCLG
(Public Health Goal) |
Major Sources in Drinking Water
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Bromodichloromethane
(Water Plant 9) |
Average: 0.52
Range: 0 – 1.14 |
ppb |
0 |
By-products of drinking water disinfection |
Bromoform
(Water Plant 2) |
0.73 |
ppb |
0 |
Bromoform
(Water Plant 3) |
1.66 |
Bromoform
(Water Plant 29 |
Average: 1.65
Range: 0 – 4.00 |
Dibromochloromethane
(Water Plant 3) |
0.90 |
ppb |
60 |
Dibromochloromethane
(Water Plant 9) |
Average: 1.49
Range: 0-3.30 |
Dibromomethane
(Water Plant 9) |
Average: 0.18
Range: 0 – 0.72 |
ppb |
NA |
Unregulated contaminants are those for which EPA has not established drinking water standards. The purpose of unregulated contaminant monitoring is to assist EPA in determining the occurrence of unregulated contaminants in drinking water and whether future regulation is warranted. MCLs (Maximum Contaminant Levels) and MCLGs (Maximum Contaminant Level Goals) have not been established for all unregulated contaminants. |
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