Infrastructure
Water Quality
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CITY OF LAWTON
WATER TREATMENT PLANT
2005 WATER QUALITY REPORT
Billing/Customer Service Information: (580) 581-3308
Websites:  www.cityof.lawton.ok.us/ or www.epa.gov/safewater


WATER QUALITY MEETS ALL STANDARDS
Water Quality

The City of Lawton is committed to providing residents with a safe and reliable supply of high-quality drinking water.  This annual "Consumer Confidence Report" required by the Safe Drinking Water Act (SDWA), tells you where your water comes from, how the treated water quality compares to the required quality standards and other things you should know about drinking water.

CrYptosporidium

Cryptosporidium is a microscopic organism that when ingested can result in diarrhea, fever and other gastrointestinal symptoms. This organism is found in most lakes and streams. 

Cryptosporidium comes from animals and humans whom are the carriers of the organism and have contact with the source water supplies.

Cryptosporidium is eliminated by effective treatment combinations including filtration, sedimentation and disinfection.

BROMATE MCL VIOLATION

Our water system recently violated a drinking water standard.  Although this is not an emergency, as our customers, you have a right to know what happened, what you should do, and what we are doing to correct this situation.

The average of the eight bromate samples submitted by the City of Lawton Water Treatment Plant for the twelve months of 2005 is .033 mg/L.  This value exceeds the MCL of .010 mg/L for bromate; therefore, the WTP is in violation for exceeding the MCL for bromate.

The United States Environmental Protection Agency (EPA) sets drinking water standards and has determined that bromate is a health concern at certain high levels of exposure.  Bromate is formed as a by-product of ozone disinfection of drinking water.  Ozone reacts with naturally occuring bromide in water to form bromate.  The EPA has set a drinking water standard to limit exposure to bromate.

WHAT SHOULD I DO?  You do not need to use an alternative (e.g. bottled) water supply.  However, if you have specific health concerns, consult your doctor.

WHAT DOES THIS MEAN?  This is not an immediate risk.  If it had been, you would have been notified immediately.  However, some people who drink water containing bromate in excess of the MCL over many years may have an increased risk of getting cancer.

WHAT HAPPENED?  WHAT IS BEING DONE?  The water treatment plant will control Bromate formation by lowering the pH of the water through the ozonization process and by lowering the ozone concentration used for disinfection.

TRIHALOMETHANES
BY-PRODUCTS OF DRINKING CHLORINATION

Million of people every year are affected by microbial contaminants (bacteria) in drinking water due to inadequate disinfection of the water supply. This is a real problem. “Microbial risks are real’. Chlorination of your water system is essential in order to protect public health. However, when chlorine is introduced into untreated water, chlorine and naturally occurring organics in the water form by- products called TRIHALOMETHANES (THMS). Some people who drink water containing THMS in excess of the MCL over many years may experience problems with their liver, kidneys or central nervous system, and may have an increased risk of cancer.

TOC VIOLATIONS

During the first, second and third quarter of 2005 the Water Treatment Plant was out of compliance for the required TOC removal.  TOC has no health effects, however, TOC can provide a medium for the formation of disinfectant by products.  The Water Treatment Plant is now in full compliance with this requirement.

MONITORING REQUIREMENT NOT MET

Our water system violated a drinking water standard over the past year.  Even though this was not an emergency, as our customers, you have a right to know what happened and what we did to correct this situation.

We are required to monitor your drinking water for specific contaminants on a regular basis. Results of regular monitoring are an indicator of whether or not our drinking water meets health standards. During September - December 2005 we did not complete all of the monitoring for Bromate and therefore cannot be sure of the quality of our drinking water during that time.

WHAT SHOULD I DO?
There is nothing you need to do at this time.

WHAT HAPPENED? WHAT IS BEING DONE?
In the month of September 2005 the laboratory doing the WTP compliance analysis for Bromate lost its certification for this analysis.  The WTP was notified of this in March 2006 and has started sending the monthly compliance sample to the ODEQ laboratory.  The monthly analysis for Bromate for 6 months was performed by a laboratory that was not certified for that analysis and as such those results cannot be relied on for accuracy.

For more information, please contact David Herring at 580-529-2703.

Please share this information with all the other people who drink this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes. schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand or mail.

SOURCE WATER PROTECTION

The City of Lawton is in the process of putting together a source water protection program. This is an ongoing effort to identify sources of possible pollution.

As these sources are identified, we will work to eliminate this pollution or to minimize its effect on the water supply. Your help is needed for this program to succeed. For more information, please visit www.epa.gov/owow/watershed.  

Sources of pollution on the Lake Lawtonka or Lake Ellsworth reservoirs or their watersheds should be reported to the Water Treatment Plant by calling 580-529-2703 or Public Works Administration at 580-581-3410.

Please use care when using pesticides or herbicides as over application can runoff into the reservoir.  Septic tanks should be serviced regularly to keep nutrients such as nitrogen and phosphorus out of the reservoir.

 WATER INFORMATION

Total Water Treated: 6,632,700,000
Daily Avg. Treated:
18,171,781
Maximum Daily Flow: 
28,100,000
Water pumped from Ellsworth:
2,850,728,000
Water pumped from Waurika:
35,099,000
Total Rainfall:
20.84”
Average temperature: 
62  Water: 63
pH Range:
6.76-9.03
Hardness: 
157 ppm or 9.16 grains/gal
Alkalinity: 
111 ppm
Fluoride: 
.99 ppm
Turbity: 
.077 ntu

SOURCES OF WATER FOR THE CITY OF LAWTON

The water for the City of Lawton comes entirely from surface sources. The primary water supply is Lake Lawtonka and the watershed that covers approximately 92 square miles. Lake Ellsworth and Lake Waurika are the city’s secondary water supplies. The watershed for Lake Ellsworth covers approximately 249 square miles, while the Lake Waurika watershed covers 562 square miles.

As water travels over the lands surface or through the ground, it dissolves naturally-occurring minerals and radioactive material, and can be polluted by animals or human activity.

Contaminants that might be expected in untreated water include: biological contaminants, such as viruses and bacteria; inorganic contaminants, such as salts and metals; pesticides and herbicides; organic contaminants from industrial or petroleum use and radioactive materials.

Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. Presence of contaminants does not necessarily indicate that the water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the U.S. Environmental Protection Agency's (EPA) Safe Drinking Water Hotline at 1-800-426-4791.


What does this report mean? The report shows the results of our water quality analyses. Every regulated contaminant that was detected in the water, even in the most minute traces, is listed here. The report contains the name of each substance, the highest level allowed by regulation (MCL), and the ideal goals for public health, the amount detected, the usual sources of such contaminants, footnotes explaining our finding, and a key to units of measurements.

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

Maximum Contaminant Level Goal or MCLG:
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.

Action Level: The concentration of a contaminant which, if exceeded, triggers a treatment or other requirement, a water system must follow.

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

Turbidity: Measurement of the cloudiness of the water. It is monitored because it is a good indicator of water quality. High turbidity can hinder the effectiveness of disinfectants.

Definitions

Pci/L=Pico curies per liter (radioactivity measurement) MCL=Maximum Contaminant Level ppm=parts per million or milligrams per liter (mg/L)
MCLG= Contaminant Level Goal TT=Treatment Technique ppb=parts per billion or micrograms per liter (ug/L)
NTU=Nephelometric Turbidity units AL=Action Level BPQL=Below practical quantitive limits

2005 WATER QUALITY DATA

REGULATED AT THE TREATMENT PLANT

Contaminant Date
Tested
Unit MCL MCLG Detected
Level
Range Major Sources Violation

Mercury
(inorganic)

10/31/2005 ppb 2 2 BPQL None Erosion of natural deposit No

Fluoride

11/07/2005

ppm

4

4

1.36

.12-1.36

Erosion of natural deposit
Treatment addition

No

Arsenic 10/31/2005 ppb 10 0 <2 None Erosion of natural deposit No
Selenium 10/31/2005 ppb 50 50 <1 None Erosion of natural deposit No

Nitrate-
nitrite

10/2005 ppm 10 10 <.10 None Runoff from fertilizer use; leaching from septic tanks, sewage, erosion of natural deposit No

Alpha
Emitters

2002 pCi/L 15 0 .3025 .18-.51 Erosion of natural deposit No

Beta/photon
Emitters

2002 pCi/L 50 0 2.93 2.66-3.22 Decay of natural and man-made deposits No
Turbidity 08/12/2005 NTU TT=.3NTU
TT=% of
Samples
<.3 NTU
0   .65    
100%
None Soil Runoff No
Barium 10/31/2005 ppm 2 2 .082 NONE Discharge of drilling wastes; discharge from metal refineries; Erosion of natural deposit No
Total Organic Carbon* (results based on a yearly avg ratio) 12/2005 ppm TT=Annual avg % removal based on raw water TOC levels and alkalinity.  To be in compliance yearly avg ratio must be 1 or greater than 1. N/A SEE BELOW yearly avg ratio:  1.02   Naturally present in environment.  Has no health effects.  Provides a medium for the formation of disinfection by products, including Trihalomethanes and Haloacetic Acids. Yes

*MONTH

1/05

 02/05

03/05

04/05

05/05

06/05

07/05

08/05

09/05

10/05

11/05

12/05

Source Water
TOC

4.53

4.93

4.73

4.61

5.55

4.43

4.53

4.41

4.31

4.52

4.79

4.52

Source Water Alkalinity

123

129

134

131

131

137

118

108

107

112

118

125

Finished Water
 TOC

3.42

3.37

3.22

3.46

4.46

3.36

3.18

2.99

2.87

2.96

3.31

3.50

Required %
removal

25

25

25

25

25

25

35

35

35

35

35

25

Actual %
removal

25

32

32

25

20

24

30

32

33

35

31

23

                         

Regulated in the Distribution System

Contaminant

Date
Tested

Unit

MCL

MCLG

Detected
Level

Range

Major Sources

Violation

Total Cloriforms

12/2005
(Monthly

%
Positive

No more than 5% positive

0

0

<1% positive

Naturally present in the environment

No

Total Trihalomethanes

12/2005
(quarterly)

ppb

80 Avg

0

63.18
(highest quarter)

31.78-63.18

By-product of chlorination

No

Haloactic Acids

12/2005
(quarterly)

ppb

60 Avg

0

13.56
(highest quarter)

<10-19.00

By-product of chlorination

No

Bromate

12/2005

ppb

10

0

174
(highest month)

<5-174

By-product of ozone disinfection

Yes

Regulated at the Customers Tap

Contaminant 

Date
Tested

Unit

MCL

MCLG

Detected
Level

Range

Major Source

Violation

Copper

8/22/2003

ppm

AL=1.3 ppm

1.3

1.1

0 sites>AL

Corrosion of household plumbing systems

No

Lead

8/28/2003

ppb

AL=15 ppb

0

3.1

0 sites>AL

Corrosion of household plumbing systems

No

SPECIAL INFO AVAILABLE:
Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone transplants, people with HIV/Aids or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health providers. EPA/CDC guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the safe drinking water hotline 1-800-426-4791.

Your water supply is safe in ALL water quality parameters. If you have any questions, please contact the Water Treatment Plant at 580-529-2703.

 


 

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