2018 Annual Drinking Water Report

CITY OF ALAMO

2018 ANNUAL DRINKING

WATER QUALITY REPORT

(CONSUMER CONFIDENCE REPORT)

(956) 787-2232 (956) 787-8321 (956) 787-0006

SPECIAL NOTICE: 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/Centers for Disease Control and Prevention (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.

PUBLIC PARTICIPATION: Regular Commissioner’s meetings are held the 1st and 3rd Tuesdays of the month, at
7:00 pm, in the Municipal Building located at 420 N Tower Road, Alamo, Texas.

ALL DRINKING WATER MAY CONTAIN CONTAMINANTS. When drinking water meets federal standards, there may not be a health-based benefit to purchasing bottled water or point of use devices. Drinking water, including bottled water, might 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. Information about contaminants and potential health effects can be obtained by calling the EPA’s safe drinking water hotline at 1-800-426-4791.

The TCEQ completed an assessment of our water and results indicate that our sources have a low susceptibility to contaminants. The sampling requirements for our water system are based on this susceptibility and previous sample data. Any detections of these contaminants may be found in this Consumer Confident Report. 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. For more information on source water assessments and protection efforts at our system contact Bobby Salinas.

Este informe incluye informacion importante sobre el agua potable. Si tiene preguntas o comentarios sobre este informe en espanol, favor de llamar al tel. (956) 787-2232 para hablar con una persona bilingue en espanol.

NOTICE MAILED 06/27/2019

WATER SOURCES: Our raw water supply is derived from the Rio Grande River and is delivered to us via numerous miles of river, dams, cement canals and cement piping which is owned and operated by the Hidalgo County Irrigation District No 2. As water is delivered, it dissolves naturally occurring minerals and even picks up substances resulting from the presence of animals or from human activity. TCEQ will be reviewing all of Texas drinking water sources. The source water assessment has been completed and the report, which will be available this year, will allow us to focus on our source water protection activities. Contaminants that might be expected in untreated water include: microbial contaminants such as viruses and bacteria; inorganic contaminants such as salts and metals; pesticides and herbicides, organic chemicals from industrial or petroleum use and radioactive contaminants resulting from oil and gas production and mining activities.

ABOUT THE ENCLOSED PAGES: the enclosed pages list all of the federally regulated or monitored constituents, which have been found in your drinking water, US EPA requires water systems to test up to 97 constituents.

SECONDARY CONSTITUENTS: Many constituents such as calcium, sodium, or iron, which are often found in drinking water, can cause taste, color, and odor problems. The taste and odor constituents are called secondary constituents and are regulated by the State of Texas not EPA. These constituents are not cause for health concerns. Therefore, secondary’s are not required to be reported in this document but they may greatly affect the appearance and taste of your water.

DEFINITIONS
MAXIMUM CONTAMINANT LEVEL (MCL)-The highest permissible level of a contaminant in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
MAXIMUM CONTAMINANT LEVEL GOAL (MCLG)-The level of a contaminant in drinking water below which there is no known or expected health risk, MCLGs allow for a margin of safety.
MAXIMUM RESIDUAL DISINFECTANT LEVEL (MRDL)-The highest level of 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 (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 contamination.
TREATMENT TECHNIQUE (TT)-A required process intended to reduce the level of a contanunant in drinking water.
ACTION LEVEL (AL)-The concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow.

ABBREVIATIONS:

NTU – Nephelometric Turbitity Units(a measure of turbidity)                                  na – not applicable

pCi/l – picocuries per liter (a measure of radioactivity)

ppb – parts per billion or micrograms per liter (mg/l)

ppq – parts per quadrillion or pictograms per liter(pg/L)

MFL – million fibers per liter (a measure of asbestos)

ppm – parts per million or milligrams per liter (mg/l)

ppt – parts per trillion or nanograms per liter

Recommended Additional Health Information for Lead

“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. This water supply 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 lead exposure by flushing your tap for 20 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 at www.epa.gov/safewater/lead.

LEAD AND COPPER

YEAR CONTAMINANT THE 90TH PERCENTILE NUMBER OF SITES EXCEEDING  ACTION LEVEL ACTION LEVEL UNIT OF MEASURE  SOURCE OF CONTAMINANT
2018  Lead .0010 0 15   ppb Corrosion of household plumbing systems; erosion of natural deposits.
2018 Copper 0.037  0 1.3  ppm  Corrosion of household plumbing systems; erosion of natural  deposits;leaching from wood preservatives.

INORGANIC CONTAMINANTS

YEAR CONTAMINANT AVERAGE LEVEL MINIMUM LEVEL MAXIMUM LEVEL MCL MCLG UNITOF MEASURE SOURCE OF CONTAMINANT
2018 Fluroide 0.51 0.51 0.51 4 4 ppm Erosion of natural deposits; water additive which promotes strong teeth; discharge from fertilizer and aluminum factories.
2018 Nitrate  .19 .19 .19 10 10  ppm Runoff from fertilizer use; leaching from septic tanks, sewage;erosion of natural deposits.
2018 Gross beta emitters 6.5 6.5 6.5 50 0 pCi/L Decay of natural and man-made deposits.
2018 Gross alpha 4.3 4.3 4.3 15 0 pCi/L Erosion of natural deposits.

ORGANIC CONTAMINANTS-Testing waived, not reported or none detected.

MAXIMUM RESIDUAL DISINFECTANT LEVEL-System must complete and submit disinfection data on the Surface Water Monthly Operations Report. On the CCR report, the system must provide disinfectant type, minimum, maximum and average levels.

YEAR DISINFECTANT AVERAGE LEVEL MINIMUM LEVEL MAXIMUM LEVEL MRDL MRDLG UNIT OF MEASURE  SOURCE OF CHEMICAL
2018 Chlorine Dioxide .4 .4  .8 .80 .80 ppm Disinfectant used to control microbes.

DISINFECTION BYPRODUCTS

YEAR CONTAMINANT AVERAGE LEVEL MINIMUM LEVEL MAXIMUM LEVEL MCL MCLG UNIT OF MEASURE  SOURCE OF CONTAMINANT
2018 Total haloacetic acids 13.7 10.6 15.8 60 ppb  Byproduct of drinking water disinfection.
2018 Total Trihalomethanes 11.4 6.4  15.3 80 pbb Byproduct of drinking water disinfection.
2018 Chlorite .68 .68  .68 1 .08 pbb Byproduct of drinking water disinfection.

Unregulated Initial  Distribution System Evaluation for Disinfection Byproducts – Waived or not yet sampled.

UNREGULATED CONTAMINANTS

Bromoform, chloroform, dislorobromomethane and dibromochloremethane are disinfection byproducts. There is no maximum contaminant level for these chemicals at the entry point to distribution.

YEAR CONTAMINANT AVERAGE LEVEL MINIMUM LEVEL MAXIMUM LEVEL UNIT OF MEASURE  SOURCE OF CONTAMINANT
2018 Chloroform 12.0 1.0 1.0 ppb Byproduct of drinking water disinfection.
2018 Bromofrom 70.4 3.3 7.6 ppb Byproduct of drinking water disinfection.
2018 Bromodichloromethane 1.9 1.1 2.6 ppb Byproduct of drinking water disinfection.
2018 Dibromochloromethane 3.6 2.0 5.3 ppb Byproduct of drinking water disinfection.

TURBIDITY has no health effects. However, turbidity can interfere with disinfection and provide a medium for microbial growth. Turbidity may indicate the presence of disease causing organisms. These Organisms include bacteria, viruses and parasites that can cause symptoms such as nausea, cramps, diarrhea and associated headaches.

YEAR  CONTAMINANT HIGHEST SINGLE MEASUREMENT LOWEST MONTHLY % OF SAMPLES MEETING LIMITS TURBIDITY LIMITS UNIT OF MEASURE SOURCE OF CONSTITUENT
2017 Turbidity .27 100.00 0.3 NTU Soil runoff.

TOTAL ORGANIC CARBON (TOC) has no health effects. The disinfectant can combine with TOCto form disinfection byproducts. Disinfection is necessary to ensure that water does not have unacceptable levels of pathogens. Byproducts of disinfection include trihalomethanes (THMs) and haloacetic acids (HAA) which are reported elsewhere in this report.

YEAR CONTAMINANT AVERAGE LEVEL MINIMUM LEVEL MAXIMUM LEVEL  UNIT OF MEASURE SOURCE OF CONTAMINANT
2018 Source water 3.5 2.9 4.0 ppm Naturally present in the environment.
2018 Drinking water 2.4 1.80 2.9 ppm Naturally present in the environment.
2018 Removal ratio 29.9% 16.1% 40.0% % removal* N/A

*removal ratio is the percent of YOC removed by the treatment process divided by the percent of TOC required by TCEQ to be removed.

TOTAL COLIFORM bacteria are used as indicators of microbial contamination of drinking water because testing for them is easy.  While not disease causing organisms themselves, they are often found in

association with other microbes that are capable of causing disease. Coliform bacteria are more hardy than many disease causing organisms; therefore, their absence from water is a good indication that the water is microbiologically safe for human consumption.

YEAR CONTANIMANT  HIGHEST MONTHLY NUMBER OF POSITIVE SAMPLES MCL UNIT OF MEASURE SOURCE OF CONTAMINANT
2018 Total Coliform   0 * Naturally present in the environment.

*Two or more coliform found samples in any single month.

Secondary and Other Constituents Not Regulated – (No associated adverse health effects)

YEAR CONSITUTENT AVERAGE LEVEL MINIMUM LEVEL MAXIMUM LEVEL SECONDARY LIMIT UNIT OF MEASURE SOURCE OF CONSTITUENT
2018 Bicarbonate 163 163 163 NA ppm Corrosion of carbonate rocks such as limestone.
2018 Chloride 210 210  210 300 ppm Abundant naturally occurring element; used in water purification; byproduct of  oil filed activity.
2018 Hardness as Ca/Mg 285 285 285 NA ppm  Naturally occurring calcium and magnesium
2018  pH 7.8  7.8 7.8 >7.0 units Measure of corrosivity of water.
2018 Sodium 183 183 183 NA ppm Erosion of natural deposits; byproduct of oil field activity.
2018 Sulfate 292 292 292  300 ppm Naturally occurring; common industrial byproduct; byproduct of oil field activity.
2018 Total Alkalinity As CaCO3 134 134 134 NA ppm Naturally occurring soluble mineral salts
2018 Total Dissolved Solids 905 905 905 1000 ppm Total dissolved mineral constituents in water.

INORGANIC CONTAMINANTS

YEAR CONTAMINANT HIGHEST LEVEL DETECTED RANGES OF LEVEL DETECTED MCLG MCL UNIT OF MEASURE SOURCE OF CONTAMINENT
2018 ARSENIC 0.0749 0.0749 0 10 ppb Erosion of natural deposits;Runoff from orchards;Runoff from glass and electronics production wastes.
2018 Barium 0.0749 0.0749 2 2 ppm Discharge of drilling wastes;Discharge from metal refineries;Erosion of natural deposits
2018 Nitrate(measured as Nitrogen) .39 .39-.39 10 10  ppm Runoff from fertilizer use;Leaching from septic tanks,sewage;Erosion of natural deposits
2018 Nitrite(measured As Nitrogen) .01 .01-.01 1    1 ppm Runoff from fertilizer use;Leaching from septic tanks,sewage;Erosion of natural deposits
2018 Selenium .0037 .0037-.0037   50 50 ppb Discharge from petroleum and metal refineries;Erosion of natural deposits; Discharge from mines.

RADIOACTIVE CONTAMINANTS

COLLECTION DATE CONTAMINANT  DETECTED HIGHLEST LEVEL DETECTED RANGE OF LEVELS MCLG MCL UNIT OF MEASURE SOURCE OF CONTAMINENT
02/21/2014 Combined Radium 226/228 0.91 0.91– 0.91 0 5 pCi/L Erosion of natural deposits.
01/10/2017
*EPA considers 50 pCi/L to be the level of concern for beta particles
Beta/photon emitters 5.6 5.6-5.6 0 50 pCi/L* Decay of natural and man-made deposits
01/10/2017 Uranium 3.1 3.1– 03.1 0 30 ug/l Erosion of natural deposits.

IN THE WATER LOSS AUDIT SUBMITTED TO TEXAS WATER DEVELOPMENT BOARD FOR THE TIME PERIOD OF JANUARY 2018 OUR SYSTEM LOST AN ESTIMATED TOTAL OF 12.81% OF WATER.

A SOURCE WATER ASSESSMENT FOR YOUR DRINKING WATER SOURCE(S) IS CURRENTLY BEING CONDUCTED BY THE TCEQ AND SHOULD BE PROVIDED TO US THIS YEAR. THE REPORT WILL DESCRIBE THE SUSCEPTIBILITY AND TYPES OF CONSTITUENTS THAT MAY COME INTO CONTACT WITH YOUR DRINKING WATER SOURCE BASED ON HUMAN ACTIVITIES AND NATURAL CONDITIONS. THE INFORMATION IN THIS ASSESSMENT WILL ALLOW US TO FOCUS ON OUR SOURCE WATER PROTECTION STRATEGIES.