2017 Water Utilities Consumer Confidence Report 2017 Water Utilities Consumer Confidence Report | Page 2

Barium ppm 0.052 0.047 0.057 2 2 Naturally present Arsenic ppb 1.0 ND 1.0 10 10 Naturally present & runoff from herbicides Chromium ppb 1.1 ND 1.1 100 100 Naturally present & industrial sources Cyanide ppb 106 ND 106 200 200 Discharge from metal / plastic / fertilizer factories Bromate 3 ppb < 5 < 5 < 5 10 10 Byproduct of drinking water disinfection Chloramines 2 ppm 3.5 3.3 3.6 MRDL = 4 MRDLG = 4 Water additive used to control microbes Fluoride ppm 0.65 0.45 0.83 4 4 Water additive promoting strong teeth Nitrate as Nitrogen ppm 0.447 0.151 0.829 10 10 Runoff from fertilizers Nitrite as Nitrogen ppm 0.089 ND 0.499 1 1 Runoff from fertilizers Total Coliform 4, 7 % ND 2.02 % 5 % NA Naturally present in the environment Total Organic Carbon( TOC)

Naturally present in the environment PB Plant( raw) ppm 4.9 3.9 6.5( PB = Pierce-Burch Plant) PB Plant( drinking) ppm 2.6 2.4 3.1 PB Removal ratio 5 % 1.4 % 1.3 % 1.5 % JK Plant( raw) ppm 4.7 4.2 5.3( JK = John F. Kubala Plant) JK Plant( drinking) ppm 2.4 2.0 2.9 JK Removal ratio 5 % 1.3 % 1.2 % 1.4 % Total Trihalomethanes 2 ppb 10.2 8.6 11.8 80 NA By-product of drinking water chlorination Haloacetic Acids( HAA5) 2 ppb 11.9 9.1 13.1 60 NA By-product of drinking water chlorination

Turbidity 6

Highest single measurement % of samples < 0.3 NTU

Table A. Regulated Substances. These substances are regulated or are required to be monitored and were detected in Arlington tap water in 2017. Arlington had no violations of state or federal guidelines in 2017

NTU %

0.07 99.9 %

Action Level

0 99.9 %

0.34 100 %

TT = 1.0 TT = 95 %

0 NA

Soil runoff

Copper( 2015) 1 ppm AL = 1.3 0 0.166 ND-0.49 Corrosion of household plumbing systems

Gross Alpha Particle Activity pCi / L < 2.0 < 2.0 15 NA

1

Instead of MCLs for lead and copper, EPA requires that 90 percent of water samples obtained from customers’ taps contain less than the Action Level for each metal. Sampling is required every 3 years.

2

Compliance is based on a calculated annual average of all samples at routine sites.

3

Compliance is based on a calculated running annual average of the quarterly averages.

4

Coliform bacteria are used as indicators of microbial contamination of drinking water because they are easily detected and found in the digestive tract of warm blooded animals. While not themselves disease producers, 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 bacteriologically safe for human consumption. The percentages shown represent the presence in samples in one month.

5

Removal ratio is the percent of TOC removed by the treatment process divided by the percent of TOC required by TCEQ to be removed. Based on running annual average of ratios.

6

Turbidity has no health effects. However, turbidity can interfere with disinfection and provide a medium for microbial growth. Turbidity may indicate the presence of

Testing for radiological substances required every 3 years.

disease-causing organisms, including bacteria, viruses and parasites that can cause symptoms such as nausea, cramps, diarrhea and associated headaches.

7

In 2017, Tarrant Regional Water District analyzed all raw water sources for cryptosporidium and giardia each month. One of the samples taken during 2017 contained 0.09 organisms per liter for giardia. No cryptosporidium was found. Cryptosporidium is a pathogen which may be found in water contaminated by feces. Although filtration removes cryptosporidium and giardia, it cannot guarantee 100 % removal.

The Environmental Protection Agency( EPA) Safe Drinking Water Hotline

Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of these contaminants does not necessarily indicate that water poses a health risk. In order to ensure that tap water is safe to drink, the EPA prescribes regulations that limit the amount of certain substances in water provided by public water systems.

More information about contaminants and potential health effects can be obtained by calling the Environmental Protection Agency’ s( EPA) Safe Drinking Water Hotline at 800-426- 4791 or visiting the website at www. epa. gov / safewater.