Table of Detected Contaminants for 2006
Contamination Units
MCLG
MCL
Level Found
Detection Range
Violation
Sample Year
Typical Sources
Bacteriological
              
**Turbidity (NTU)
N/A
TT
0.20
.05-.20
NO
2006
Soil Runoff
Turbidity (% Sampling Meeting Standard)
N/A
TT
100%
N/A
NO
2006
Soil Runoff
Inorganic's
              
***Lead (ug/l)
0.0
15
2.4
<2.0-2.4
NO
2005
Household plumbing erosion
***Copper (ug/l)
0.0
1,300
52
<10-52
NO
2005
Household plumbing corrosion and leaching from wood preservatives
Nitrate (mg/l)
10.0
10.0
.475
<.10-.475
NO
2006
Runoff from fertilizer and leachate from septic tanks
Fluoride (mg/l)
4
4
1.15
.88-1.15
NO
2006
Additive for strong teeth
Barium (ug/l)
2000
2000
8.6
N/A
NO
2006
Mineral deposits, concrete, paint
Volatile Organics
              
TTHM's (ug/l) Total Trihalomethanes
N/A
80
63 avg.
43-91
NO
2006
Water purification by-product
Haloacetic Acid (ug/l)
N/A
60
39 avg.
30-47
NO
2006
Water purification by-product
Chloroform (ug/l)
N/A
N/A
52.0
N/A
NO
2006
Water purification by-product
Bromodichloromethane (ug/l)
N/A
N/A
2.4
N/A
NO
2006
Water purification by-product
Total Organic Carbon (ppm)
N/A
N/A
1.92
1.27-1.95
NO
2006
From something that has lived
Atrazine(ppb)
N/A
N/A
.32
N/A
NO
2006
Herbicide, weed killer
               

Definition of Terms
Maximum Contaminant Level Goal (MCLG): The level of contaminant in drinking water below which there is no known or expected health risk. MCLGs allow for a margin of safety.

Maximum Contaminant Level (MCL): The highest level of contaminant allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.

Parts per Million (ppm) or Milligrams per Liter (mg/l): Both terms are units of measure for concentration of a contaminant. Both terms correspond to one second in a little over 115 days.

Parts per Billion (ppb) or Micrograms per Liter (ug/l): Both terms are units of measure for concentration of a contaminant. Both terms correspond to one second in 31.7 years.

Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
Treatment Technique: A required process intended to reduce the level of a contaminant in drinking water.

The “<” Symbol: A symbol which means less than. A sampling result of <5 means the lowest level that could be detected is 5 and the contaminant in the sample is less than 5.

N/A: not applicable, does not apply.

TT: Treatment Technique is a required process intended to reduce the level of a contaminant in drinking water.

Nephelometric Turbidity Unit (NTU): Nephelometric Turbidity Unit is a measure of the clarity of the water. Turbidity in excess of 5 NTU is just noticeable by the average person.

* Secondary Maximum Contaminant Level (SMCLs): are maximum levels for contaminants involving taste, color, odor, or appearance of water, and do NOT generally pose a health risk.

** Turbidity is a measure of the cloudiness of water and is an indication of the effectiveness of the filtration system.
The turbidity limit set by the EPA is .3 NTU in 95% of the daily samples and shall not exceed 5 NTU at any time.

*** The 15 and 1,300 ug/l listed under the heading of maximum contaminant level (MCL) for lead and copper respectively, are action levels. Action levels are the thresholds of sampling at the 90th percentile.