Consumer Confidence Report for 2020

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

ANNUAL DRINKING WATER QUALITY REPORT FOR 2020
TOWN OF CENTREVILLE
PWSID # 0170001
APRIL, 2021
We're pleased to present to you this year's Annual Water Quality Report. 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. We want you to understand
the efforts we make to continually improve the water treatment process and protect our water
resources. We are committed to ensuring the quality of your water. The Town’s water source is
located in the Aquia formation.
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.
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 people 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
microbiological contaminants are available from the Safe Drinking Water Hotline (800-426-4791).
We want our valued customers to be informed about their water utility. If you want 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 pm at the Liberty building, 107 North Liberty Street.
If you have any questions about this report or have questions concerning your water quality, please
call Kip Matthews Director of Public Works at 410-758-1180.
The Town of Centreville routinely monitors for contaminants in your drinking water according to
Federal and State laws. This table shows the results of our monitoring for the period of January 1st
to December 31st, 2020. As water travels over the land or underground, it can pick up substances
or contaminants such as microbes, inorganic and organic chemicals, and radioactive substances.
All drinking water, including bottled drinking water, may be reasonably expected to contain at
least small amounts of some contaminants. It's important to remember that the presence of these
contaminants does not necessarily pose a health risk.
In this table you will find many terms and abbreviations you might not be familiar with. To help
you better understand these terms we've provided the following definitions:
Parts per million (ppm) or Milligrams per liter (mg/l) - one part per million corresponds to one
minute in two years or a single penny in $10,000.
Parts per billion (ppb) or Micrograms per liter - one part per billion corresponds to one minute in
2,000 years, or a single penny in $10,000,000.

Picocuries per liter (pCi/L) - picocuries per liter is a measure of the radioactivity in water.
Action Level - the concentration of a contaminant which, if exceeded, triggers treatment or other
requirements which a water system must follow.
Maximum Contaminant Level - The “Maximum Allowed” (MCL) is 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 - The “Goal” (MCLG) is 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.
TEST RESULTS
Contaminant Violation Level Unit MCLG MCL Likely Source of Contamination
Y/N Detected Measurement
Radioactive Contaminants
Beta/photon emitters N 10.4 pCi/l 0 50 Decay of natural and man-made
(2017) deposits
Inorganic Contaminants
Arsenic (2020) N ppb 0 10 Erosion of natural deposits; runoff
Highest Lever Detected 2 from orchards; runoff from glass and
electronics production wastes
Copper (distribution) N 0.13 ppm 1.3 AL=1.3 Corrosion of household plumbing
(2018) systems; erosion of natural deposits;
leaching from wood preservatives
Fluoride (2020) N 0.44 ppm 4 4 Erosion of natural deposits; water
additive which promotes strong teeth;
discharge from fertilizer and
aluminum factories
Chlorine (2020) N 0.6 ppm 4 4 Water Additive used to control
microbes
Barium (2020) N 0.134 ppm 2 2 Discharge of drilling wastes;
discharge from metal refineries;
erosion of natural deposits
Volatile Organic Contaminants
Haloacetic Acids (HAA5) N 7.81 ppb n/a 60 By-product of drinking water
(distribution) (2019) chlorination
Total Trihalomethanes N 9.95 ppb n/a 80 By-product of drinking water
(TTHM) (2019) disinfection
Note: Test results are for year 2020 or as indicated; not all contaminants are required to be tested for annually. These
are our most recent results.
NOTE: lead, which is tested for triennial (every 3 years) in accordance with Federal and State Regulations
in Centreville’s distribution system, was not detected in our most recently collected samples 2018.

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. The Town of Centreville is responsible for
providing high quality drinking water, but 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 drinking 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 EPA Safe Drinking Water Hotline at 1-800-426-4791 or
at http://www.epa.gov/safewater/lead.
MCL’s are set at very stringent levels. To understand the possible health effects described for
many regulated contaminants, a person would have to drink 2 liters of water every day at the MCL
level for a lifetime to have a one-in-a-million chance of having the described health effect.
All sources of drinking water are subject to potential contamination by substances that are naturally
occurring or man-made. These substances can be microbes, inorganic or organic chemicals and
radioactive substances. All 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 the water poses a health risk. More information about contaminants and
potential health effects can be obtained by calling the Environmental Protection Agency’s Safe
Drinking Water Hotline at 1-800-426-4791.
Violation: Nitrate (measured as Nitrogen); Monitoring, Routine Major 01/01/2020-
12/31/2020: We failed to test the drinking water for the contaminant and the period indicated.
Because of this failure, we cannot be sure of the quality of our drinking water during the period
indicated.
Violation: Haloacetic Acids (HAA5); Monitoring, Routine (DBP), Major 01/01/2020-
12/31/2020: We failed to test our drinking water for the contaminant and the period indicated.
Because of this failure, we cannot be sure of the quality of our drinking water during the period
indicated.
Violation: Total Trihalomethanes (TTHM); Monitoring, Routine (DBP), Major 01/01/2020-
12/31/2020: We failed to test the drinking water for the contaminant and the period indicated.
Because of this failure, we cannot be sure of the quality of our drinking water during the period
indicated.
Thank you for allowing us to continue providing your family with clean, quality water this year.
In order to maintain a safe and dependable water supply we sometimes need to make improvements
that will benefit all of our customers. These improvements are sometimes reflected as rate structure
adjustments. Thank you for understanding.