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2021 Annual Drinking Water Quality Report of Keystone Postmaster Grid
Clay County Utility Authority is very pleased to provide you with this year's Annual Water Quality Report. We want to
keep you informed about the excellent water and services we have delivered to you over the past year. Our goal is and
always has been, to provide to you a safe and dependable supply of drinking water.
Keystone Postmaster Grid PWS ID # 2100610 routinely monitors for contaminants in your drinking water according to
federal and state laws, rules, and regulations. Except where indicated otherwise, this report is based on the results of our
monitoring for the period of Jan. 1 to Dec. 31, 2021. The state allows us to monitor for some contaminants less than once
per year because the concentrations of these contaminants do not change frequently. Some of our data, though
representative, are more than one-year old. Data obtained before Jan. 1, 2021, and presented in this report is from the most
recent testing done in accordance with the laws, rules, and regulations.
Keystone Postmaster Grid is comprised of three water treatment plants (WTPs), Keystone Heights WTP, Keystone Club
WTP, and Postmaster WTP. Our water source is ground water from wells that draw from the Floridan Aquifer. Our water
is chlorinated for disinfection purposes at all three WTPs. At Postmaster WTP, the water is also aerated for odor removal.
This report shows our water quality results and what they mean.
In the table below, you may find unfamiliar terms and abbreviations. To help you better understand these terms we've
provided the following definitions:
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.
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 (AL): The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a
water system must follow.
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 MRDLG: The level of a drinking water disinfectant below which there is no
known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial
contaminants.
‘ND’ means not detected and indicates that the substance was not found by laboratory analysis.
Parts per billion (ppb) or micrograms per liter (µg/l): one part by weight of analyte to 1 billion parts by weight of the
water sample.
Parts per million (ppm) or milligrams per liter (mg/l): one part by weight of analyte to 1 million parts by weight of the
water sample.
Inorganic Contaminants
Contaminant
and Unit of
Measurement
Dates of
sampling
(mo/yr)
MCL
Violation
Y/N
Level Detected Range of Results MCLG MCL Likely Source of
Contamination
Arsenic (ppb) 02/20 N 1.9 0.24 – 1.9 0 10
Erosion of natural
deposits; runoff from
orchards; runoff from
glass and electronics
production wastes
Barium (ppm) 02/20 N 0.0069 0.0049 - 0.0069 2 2
Discharge of drilling
wastes; discharge from
metal refineries;
erosion of natural
deposits
Fluoride
(ppm) 02/20 N 0.24 0.18 – 0.24 4 4.0
Erosion of natural
deposits; discharge
from fertilizer and
aluminum factories.
Water additive which
promotes strong teeth
when at the optimum
level of 0.7 ppm
Nitrate (as
Nitrogen)
(ppm)
02/20 N 0.47 0.15 – 0.47 10 10
Runoff from fertilizer
use; leaching from
septic tanks, sewage;
erosion of natural
deposits
Selenium
(ppb) 02/20 N 0.63 ND – 0.63 50 50
Discharge from
petroleum and metal
refineries; erosion of
natural deposits;
discharge from mines
Sodium (ppm) 02/20 N 10 8.3 - 10 N/A 160 Saltwater intrusion,
leaching from soil
Thallium
(ppb) 02/20 N 0.069 ND - 0.069 0.5 2
Leaching from ore-
processing sites;
discharge from
electronics, glass, and
drug factories
Synthetic Organic Contaminants including Pesticides and Herbicides
Contaminant and Unit of
Measurement
Dates of
sampling
(mo/yr)
MCL
Violation Y/N
Level
Detected
Range of
Results MCLG MCL Likely Source of
Contamination
Dalapon (ppb) 01/21 – 12/21 N 1.5 ND – 1.5 200 200 Runoff from herbicide
used on rights of way
Stage 1 Disinfectants and Disinfection By-products
Disinfectant
or
Contaminant
and Unit of
Measurement
Dates of
sampling
(mo/yr)
MCL or
MRDL
Violation
Y/N
Level Detected Range of
Results
MCLG
or
MRDLG
MCL or MRDL Likely Source of
Contamination
Chlorine
(ppm)
1/21 –
12/21 N 2.14 1.5 - 2.5 MRDLG
= 4 MRDL = 4.0 Water additive used to
control microbes
Stage 2 Disinfectants and Disinfection By-Products
Contaminant
and Unit of
Measurement
Dates of
sampling
(mo/yr)
MCL Violation
(Y/N) Level Detected Range of Results MCLG MCL Likely Source of
Contamination
Haloacetic Acids
(HAA5) (ppb) 08/21 N 4.39 N/A N/A 60 By-product of drinking
water disinfection
Contaminant
and Unit of
Measurement
Dates of
sampling
(mo/yr)
MCL Violation
(Y/N) Level Detected Range of Results MCLG MCL Likely Source of
Contamination
Total
Trihalomethanes
(TTHM) (ppb)
08/21 N 14.54 N/A N/A 80 By-product of drinking
water disinfection
Lead and Copper (Tap Water)
Contaminant
and Unit of
Measurement
Dates of
sampling
(mo/yr)
AL Exceeded
(Y/N)
90th Percentile
Result
No. of sampling
sites exceeding the
AL
MCLG
AL
(Action
Level)
Likely Source of
Contamination
Copper (tap
water) (ppm) 07/20 N 0.055 0 1.3 1.3
Corrosion of household
plumbing systems;
erosion of natural
deposits; leaching from
wood preservatives
Lead (tap
water) (ppb) 07/20 N 0.5 0 0 15
Corrosion of household
plumbing systems;
erosion of natural
deposits
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.
Clay County Utility Authority 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 two 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.
In 2021, the Florida Department of Environmental Protection (DEP) performed a Source Water Assessment on our system
and a search of the data sources indicated no potential sources of contamination near our wells. The assessment results are
available on the DEP Source Water Assessment and Protection Program (SWAPP) website at
https://fldep.dep.state.fl.us/swapp/.
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.
Contaminants that may be present in source water include:
(A) Microbial contaminants, such as viruses and bacteria, which may come from sewage treatment plants,
septic systems, agricultural livestock operations, and wildlife.
(B) Inorganic contaminants, such as salts and metals, which can be naturally occurring or result from
urban stormwater runoff, industrial or domestic wastewater discharges, oil and gas production,
mining or farming.
(C) Pesticides and herbicides, which may come from a variety of sources such as agriculture, urban
stormwater runoff and residential uses.
(D) 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 stormwater runoff, and septic systems.
(E) Radioactive contaminants, which can be naturally occurring or be the result of oil and gas production
and mining activities.
To ensure that tap water is safe to drink, the EPA prescribes regulations, which limit the amount of certain contaminants
in water provided by public water systems. The U.S. Food and Drug Administration (FDA) regulations establish limits for
contaminants in bottled water, which must provide the same protection for public health.
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.
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. U.S.
Environmental Protection Agency/Center for Disease Control 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).
This report is also available at CCUA’s Administrative Building located at 3176 Old Jennings Road, Middleburg, FL
32068 upon request. We at CCUA would like 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. If you have
any questions or concerns about the information provided, please feel free to call any of the numbers listed.
If you have any questions about this report or concerning your water utility, please contact Heather Webber at 904-219-
4114 or hwebber@clayutility.org. We encourage our valued customers to be informed about their water utility. If you
want to learn more, please attend any of our regularly scheduled meetings. They are held on the first and third Tuesdays of
every month at 2:00pm in the Board Room of the CCUA Administrative Building at 3176 Old Jennings Road,
Middleburg, Florida, 32068. You can also obtain additional information from EPA at their Safe Drinking Water Hotline
(800-426-4791).