Shoremont WTP

Brockport WTP

Hemlock WTP

T.Ontario WTP

Substances

Units

MCLG

MCL

Range of detected values

Range of detected values

Range of detected values

Range of detected values

Likely Source

Meets EPA Standards

Arsenic

ug/L

NS

10

ND – 1.6

ND - 1

ND - 1.6

Not
Detected

Erosion of natural deposits

Yes

Barium

mg/L

2

2

0.019 - 0.029

0.020 - 0.023

0.017 - 0.023

0.023

Erosion of natural deposits

Yes

Chloride

mg/ L

NA

250

21 - 25

22 - 25

25 - 28

NA

Yes

Fluoride

mg/L

NA

2.2

0.25 -1.2

0.11 - 1.25

0.65 - 1.22

0.85 – 1.15

Natural and additive which promotes strong teeth

Yes

Manganese

ug/L

NS

300

Not Detected

Not Detected

ND - 3

NA

Naturally occurring

Yes

Nitrate

mg/L

10

10

ND - 0.5

ND - 0.4

ND - 0.02

2.13

Erosion of natural deposits

Yes

Sodium

mg/L

NS

NS

12

11 - 12

15 - 17

NA

Naturally occurring

Yes

Sulfate

mg/L

NS

250

25 - 31

22 - 27

16 – 18

NA

Naturally occurring

Yes

Color

Color Units

NA

15

ND - 3

ND - 3

ND – 3

NA

Naturally occurring

Yes

Turbidity Treatment Requirements - 95% of samples each month must be less than 0.5 NTU. 100% of last year samples for all three sources were less than 0.5 NTUs. Turbidity is a measure of water clarity and is used to gauge filtration performance.

Turbidity - Entry Point

NTUs

NA

TT

0.02 - 0.14

0.01 - 0.19

0.05 - 0.16

0.02 – 0.08

Soil runoff

Yes

Organics, Pesticides, Herbicides

Atrazine

ug/L

3

3

Not
Detected

ND – 0.1

Not
Detected

Not
Detected

Runoff from herbicides used on row crops

Yes

Bis(2-Ethylhexyl)Phthalate

ug/L

0

6

Not
Detected

ND – 0.7

Not
Detected

Not
Detected

Production/disposal of plastics, Common Lab Contaminant

Yes

Napthalene

Ug/L

NA

50

Not
Detected

Not
Detected

Not
Detected

6.4

Gas, fuel oil and coal tar air emissions and spills

Yes

Disinfectant and Disinfectant By-products (DBPs) - Average and Range is listed. * The MDRL (Maximum Disinfectant Residual Level) for chlorine is 4. Chlorine does not have an MCL. HAN, HK, CP, CH, and TOX are DBPs being considered for future regulation by the EPA.

Chlorine Residual - Entry Point

mg/L

4 *

4 *

0.8 - 1.7

1.2 – 2.1

0.6 - 1.4

0.8 – 1.2

Additive for control of microbes

Yes

Total THMs

ug/L

NA

80

34 (12-54)

34 (20-50)

41 (30-68)

27 (14-38)

By-product of water chlorination

Yes

Haloacetic Acids (HAA5)

ug/L

NA

60

11 (2-22)

16 (6-37)

20 (14-30)

NR

By-product of water chlorination

Yes

Haloacetilenitriles (HAN) 1998 data

ug/L

NA

50

4.4 (3.4-5.5)

NR

3.9 (1.5-5.3)

NR

By-product of water chlorination

Yes

Haloketones (HAK) 1998 data

ug/L

NA

50

1.8 (0.9-3.40

NR

4.5 (1.2-7.6)

NR

By-product of water chlorination

Yes

Chloropicrin (CP) 1998 data

ug/L

NS

NS

Not Detected

NR

0.5 (ND-0.8)

NR

By-product of water chlorination

Yes

Chloral Hydrate (CH) 1998 data

ug/L

NS

NS

4.6 (1.6-12)

NR

8.5 (1.6-13)

NR

By-product of water chlorination

Yes

Total Organic Halides (TOX)1998 data

ug/L

NS

NS

101 (54-158)

NR

245 (11-350)

NR

By-product of water chlorination

Yes

Lead and Copper - 90% of samples must be less than the Action Level (AL). 90th Percentile value and the number of samples exceeding AL is listed.

Copper (Customer Tap Samples)

mg/L

1.3

AL=1.3

0.077
None Exceeded AL (2000)

0.080
None Exceeded AL

0.204
None Exceeded AL (2000)

0.078
None Exceeded AL (1999)

Corrosion
of household
plumbing

Yes

Lead (Customer Tap Samples)

ug/L

0

AL=15

3
One Exceeded AL (2000)

11
One Exceeded AL (2000)

ND (1999)

Corrosion of
household
plumbing

Yes

Key Terms

MCL = Maximum Contaminant Level, the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as possible.

MCLG = Maximum Contaminant Level Goal, the level of a contaminant below which there is no known or expected risk to health. MCLGs allow for a margin of safety.

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

AL = Action Level, the concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.

ND = Not Detected, absent or present at less than testing method detection level. All testing methods are EPA approved with detection limits much less than the MCL.

NA = Not applicable NR = Not Required NS = No standard

mg/l = milligram (1/1,000 of a gram) per liter = ppm = parts per million

ug/l = microgram (1/1,000,000 of a gram) per liter = ppb = parts per billion

NTU = Nephelometric Turbidity Unit, a measure of water clarity.