2017 Water Utilities Consumer Confidence Report 2017 Water Utilities Consumer Confidence Report | Página 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 .