Consumer Confidence Report for 2019

Exactly as extracted, unformatted — for checking against the original. The readable version is easier to read.

ANNUAL DRINKING WATER QUALITY REPORT FOR 2019
TOWN OF CENTREVILLE
PWSID # 0170001
June 2020
We are pleased to present to you this year's Annual Water Quality Report for the period of January 1 to December 31, 2019. This report is
designed to inform you about the water quality and services we deliver to you every day. Our constant goal is to provide you with a safe and
dependable supply of drinking water and to continually improve the water treatment process and protect our water resources. We are committed to
ensuring the quality of your water. The source drinking water for the Town of Centreville’s is Ground Water located in the Aquia formation from
two wells within the town limits.
The Maryland Department of the Environment’s Water Supply Program completed a Source Water Assessment for the Town of Centreville in
2003. A copy of that assessment can be reviewed at Town Hall.
We would like our valued customers to be informed about their water utility. If you would like to learn more, please attend any of our regularly
scheduled Town meetings held on the first and third Thursday of each month at 7:00 p.m. at the Liberty building, 107 North Liberty Street. Due to
COVID-19 and the County and Town policy, no public access to the building is currently permitted. Public comments to be read at the meeting can
be forwarded before 5:00 p.m. the day of the meeting to Carolyn Brinkley, Town Clerk, cbrinkley@townofcentreville.org. To view the Town Council
meetings, live, go to QAC-TV's Facebook page. Centreville Town Council meetings will also air live on QAC-TV therefore, anyone with Atlantic
Broadband can view the meeting live on Channel 7 or 77.
If you have any questions about this report or have questions concerning your water quality, please call John Gannon, Supervisor of Water and
Wastewater at 410-758-1180.
Este informe cotiene informacion muy importante sobre el aqua que usted bebe. Traduzcalo o hable con alguien que lo entienda bien.
The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water
travels over the surface of the land or through the ground, it dissolves naturally-occurring minerals and, in some cases, radioactive material, and
can pick up substances resulting from the presence of animals or from human activity.

Please call John Gannon, Water and Wastewater Supervisor at 410-758-1180 if you have any questions about this notice.
Contaminants that may be present in source water include:
 Microbial contaminants, such as viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural
livestock operations, and wildlife.
 Inorganic contaminants, such as salts and metals, which can be naturally-occurring or result from urban storm water runoff, industrial
or domestic wastewater discharges, oil and gas production, mining, or farming.
 Pesticides and herbicides, which may come from a variety of sources such as agriculture, urban storm water runoff, and residential
uses.
 Organic chemical contaminants, including synthetic and volatile organic chemicals, which are by-products of industrial processes and
petroleum production, and can also come from gas stations, urban storm water runoff, and septic systems.
 Radioactive contaminants, which can be naturally-occurring or be the result of oil and gas production and mining activities.
Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of
contaminants does not necessarily indicate that water poses a health risk. More information about contaminants and potential health effects can be
obtained by calling the EPA Safe Drinking Water Hotline at (800) 426-4791.
In order to ensure that tap water is safe to drink, EPA prescribes regulations which limit the amount of certain contaminants in water provided by
public water systems. FDA regulations establish limits for contaminants in bottled water which must provide the same protection for public health.
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 organ transplants, people
with HIV/AIDS or other immune system disorders, some elderly and infants can be particularly at risk from infections. These individuals should seek
advice about drinking water from their health care 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 at (800) 426-4791.
If present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is
primarily from materials and components associated with service lines and home plumbing. We cannot control the variety of materials used in
plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for
30 seconds to 2 minutes before using water for drinking or cooking. If you are concerned about lead in your water, you may wish to have your water
tested. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available from the Safe Drinking
Water Hotline or at http://www.epa.gov/safewater.lead.

Source Water Information
Source Water Name Type of Water Report Status Location
(NORTH BROOK) WELL 6 QA943510 GW Y NEAR 1 MI N OF CENTREVILLE APPROX. 100 FT
W OF WEXFORD DRIVE
CENTREVILLE WELL 5 QA941390 GW Y T OF CENTREVILLE APPROX. .3 MI E OF RT 213
Lead and Copper
Definitions: Action Level Goal (ALG): The level of a contaminant in drinking water below which there is no known or expected risk to health. ALGs
allow for a margin of safety. Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a
water system must follow.
Lead and Date Action Level 90th # Sites Over Lead and
MCLG Units Likely Source of Contamination
Copper Sampled (AL) Percentile AL Copper
Erosion of natural deposits; Leaching
Copper 09/24/2018 1.3 1.3 0.13 0 ppm Copper from wood preservatives; Corrosion of
household plumbing systems.
NOTE: Lead is tested for triennial (every 3 years) in accordance with Federal and State Regulations in Centreville’s distribution system,
and was not detected in our most recently collected samples 2018.

Water Quality Test Results
Definitions: The following tables contain scientific terms and measures, some of which may require explanation.
Avg: Regulatory compliance with some MCLs are based on running annual average of monthly samples.
Maximum Contaminant Level or 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.
Level 1 Assessment: A Level 1 assessment is a study of the water system to identify potential problems and determine (if
possible) why total coliform bacteria have been found in our water system.
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.
Level 2 Assessment: A Level 2 assessment is a very detailed study of the water system to identify potential problems and
determine (if possible) why an E. coli MCL violation has occurred and/or why total coliform bacteria have
been found in our water system on multiple occasions.
Maximum residual disinfectant level or 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 or The level of a drinking water disinfectant below which there is no known or expected risk to health.
or MRDLG: MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
na: not applicable.
mrem: millirems per year (a measure of radiation absorbed by the body)
ppb: micrograms per liter or parts per billion - or one ounce in 7,350,000 gallons of water.
ppm: milligrams per liter or parts per million - or one ounce in 7,350 gallons of water.
Treatment Technique or TT: A required process intended to reduce the level of a contaminant in drinking water.

Regulated Contaminants
Disinfectants and Collection Highest Level Range of Levels MCLG MCL Units Violation Likely Source of Contamination
Disinfection By- Date Detected Detected
Products
Chlorine 0.7 0.4 - 0.7 MRDLG = 4 MRDL = 4 ppm N Water additive used to control
microbes.
Haloacetic Acids 08/11/2016 1 0 - 1 No goal for 60 ppb N By-product of drinking water
(HAA5) the total disinfection
Not all sample results may have been used for calculating the Highest Level Detected because some results may be part of
an evaluation to determine where compliance sampling should occur in the future
Haloacetic Acids 08/11/2016 1 0 - 1 No goal for 60 ppb N By-product of drinking water
(HAA5) the total disinfection.
Not all sample results may have been used for calculating the Highest Level Detected because some results may be part of
an evaluation to determine where compliance sampling should occur in the future
Haloacetic Acids 08/11/2016 1 0 - 1 No goal for 60 ppb N By-product of drinking water
(HAA5)* the total disinfection.
Not all sample results may have been used for calculating the Highest Level Detected because some results may be part of
an evaluation to determine where compliance sampling should occur in the future
Total Trihalomethanes 08/11/2016 2 0.6 - 2 No goal for 80 ppb N By-product of drinking water
(TTHM) the total disinfection
Not all sample results may have been used for calculating the Highest Level Detected because some results may be part of
an evaluation to determine where compliance sampling should occur in the future
Total Trihalomethanes 08/11/2016 2 0.6 - 2 No goal for 80 ppb N By-product of drinking water
(TTHM) the total disinfection.
Not all sample results may have been used for calculating the Highest Level Detected because some results may be part of
an evaluation to determine where compliance sampling should occur in the future
Inorganic Collection Highest Level Range of Levels MCLG MCL Units Violation Likely Source of Contamination
Contaminants Date Detected Detected
Arsenic 3 0 - 8 0 10 ppb N Erosion of natural deposits;
Runoff from orchards; Runoff
from glass and electronics
production wastes.
Barium 0.13 0 - 0.13 2 2 ppm N Discharge of drilling wastes;
Discharge from metal refineries;
Erosion of natural deposits.
Fluoride 0.45 0.45 - 0.45 4 4.0 ppm N Erosion of natural deposits;
Water additive which promotes
strong teeth; Discharge from
fertilizer and aluminum
factories.

Radioactive Collection Highest Level Range of Levels MCLG MCL Units Violation Likely Source of Contamination
Contaminants Date Detected Detected
Beta/photon emitters 08/08/2017 10.4 10.4 – 10.4 0 4 Mrem/y N Decay of natural and man-made
r deposits.
Beta/photon emitters 08/08/2017 10.4 10.4 – 10.4 0 50 pCi/L N Decay of natural and man-made
deposits.
Thank you for allowing us to continue providing clean, quality water this year. In order to maintain a safe and dependable water supply the Town
sometimes will make improvements that will benefit all of our customers.
Please call John Gannon, Water and Wastewater Supervisor at 410-758-1180 if you have questions about this report.