This table shows data for samples collected during 2023 (unless otherwise noted). Analyses made by professionals after water treatment showed the levels of all contaminants found were much less than the maximum allowable levels established by the state and federal regulatory agencies.
| *Definitions: | ||||||||
| AL = Action Level: The concentration of a contaminant which, if exceeded, triggers a treatment or other requirement which a water system must follow. | ||||||||
| MCL = Maximum Contaminant Level: 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. | ||||||||
| MCLG = Maximum Contaminant Level Goal: The level of contaminant in drinking water below which there is no known or expected health risk. | ||||||||
| MRDL = Maximum Residual Disinfectant Level: The highest level of disinfectant allowed in drinking water. | ||||||||
| LRAA = Locational Running Annual Average: The average of the last 12 months or last 4 quarters for each monitoring location. Calculated RAA might include results from 2022. | ||||||||
| NTU = Nephelometric Turbidity Unit | ||||||||
| TT = Treatment Technique: A required process intended to reduce the level of a contaminant in drinking water. | ||||||||
| su = Standard Units | ||||||||
| ppm: parts per million or milligrams per liter (mg/L) | ||||||||
| ppb: parts per billion or micrograms per liter (ug/L) | ||||||||
| CFU: Colony Forming Units | ||||||||
| pCi/L: picocuries per liter (a measure of radioactivity) | ||||||||
| mrem= millirem: The unit of radiation dose. | ||||||||
| ** The U.S. Public Health Service recommended a fluoride concentration of 0.7 mg/L (parts per million [ppm]) to maintain dental cavity prevention benefits and reduce the risk of dental fluorosis. COT ordinances require the maximum content of fluoride to be no more than 0.7 ppm. | ||||||||
| *** The MCL for beta particles is 4 mrem*/year. EPA considers 50 pCi/L to be the level of concern for beta particles. | ||||||||
| **** Calculated RAA includes the results from 2022. And the range reflects the results in 2023. | ||||||||
| Regulated Contaminants | Unit | Ideal Goal (MCLG*) | Highest Level Allowed (MCL*) | Our Tap Water | Compliance | Likely Source of Contaminants | ||
| Inorganic Compounds | ||||||||
| Atrazine | ppb* | 3 | 3 | Highest Running Annual Average: 0.384**** | Yes | Runoff from herbicide used on row crops. | ||
| Range detected: 0.312 - 0.353 | ||||||||
| Barium | ppm* | 2 | 2 | Highest level: 0.061 | Yes | Naturally present in the environment, drilling waste, metal refineries. | ||
| Range detected: 0.033 - 0.061 | ||||||||
| Chlorite | ppm | 0.8 | 1 | Highest level: 0.320 | Yes | By-product of drinking water disinfection. | ||
| Range detected: 0 - 0.320 | ||||||||
| Copper | ppm | 1.3 | 1.3 (AL*) | 90th percentile = 0.390 | Yes | Corrosion of household plumbing systems, erosion of natural deposits, leaching from wood preservatives. | ||
| 0 sites above AL* | ||||||||
| Fluoride | ppm | 4 | 4 | Average detected: 0.69 ** | Yes | Erosion of natural deposits, water additive which promotes strong teeth, discharge from fertilizer and aluminum factories. | ||
| Range detected: 0.38- 0.88 | ||||||||
| Lead | ppb | 0 | 15 (AL*) | 90th percentile = 1.06 | Yes | Corrosion of household plumbing systems, erosion of natural deposits. | ||
| 0 sites above AL* | ||||||||
| Nitrate/Nitrite Total | ppm | 10 / 1 | Nitrate=10 Nitrite=1 | Highest level: 1.90 | Yes | Naturally occurring, fertilizers, sewage treatment plants, leaching from septic tanks, erosion of natural deposits. | ||
| Total =11 | Range detected: 0 - 1.90 | |||||||
| Disinfection Residual | ||||||||
| Chloramine as Chlorine | ppm | 4 | 4.0 (MRDL*) | Highest Running Annual Average: 2.5 | Yes | Water additive used to control microbes. | ||
| Range detected: 1.6 - 3.1 | ||||||||
| Disinfection By-Procucts | ||||||||
| Total Trihalomethanes | ppb | N/A | 80 (LRAA*) | Highest Locational Running Annal Average (LRAA): 35 | Yes | By-product of drinking water disinfection. | ||
| Range detected: 17 - 45 | ||||||||
| Haloacetic Acids | ppb | N/A | 60 (LRAA*) | Highest Locational Running Annal Average (LRAA): 22**** | Yes | By-product of drinking water disinfection. | ||
| Range detected: 5.0 - 16 | ||||||||
| Precursor Removal | ||||||||
| Total Organic Carbon | N/A | N/A | TT* = Ratio must be greater than or equal to 1.00 for compliance | Running Annual Average 1.69 | Yes | Naturally found in the environment. | ||
| Lowest Month for Removal: December 1.27 | ||||||||
| Microbiological | ||||||||
| Coliform Bacteria | CFU* | 0 | Presence of Coliform bacteria in < 5% of samples | Month having the highest % positive: November | Yes | Naturally present in the environment. | ||
| 2 positive Coliform results in 218 samples: 0.92% | ||||||||
| Clarity | ||||||||
| Turbidity | NTU* | N/A | TT*= less than 0.3 NTU 95 percent of the time. | Lowest monthly % of samples with < 0.3 NTU: 100% | Yes | Soil runoff. | ||
| Highest single reading: 0.13 | ||||||||
| Radiological: Most recent testing in December 2022 | ||||||||
| Gross Alpha | pCi/L* | 0 | 15 | < 3.00 | Yes | Erosion of natural deposits. | ||
| Gross Beta | pCi/L | 0 | 50 *** | <4.00 | Yes | Decay of natural and man-made deposits. | ||
| Radium 226 | pCi/L | 0 | 5 (Combined Total) | < 1.00 | Yes | Erosion of natural deposits. | ||
| Radium 228 | pCi/L | 0 | < 1.00 | Yes | Erosion of natural deposits. | |||
| Secondary Contaminants | Recommended Level (Non-Health Based Standards) | Likely Source of Contaminants | ||||||
| Chloride | ppm | 250 | Average detected: 13.3 | Naturally present, brine from oilfield operations. | ||||
| Range detected: 10.8 - 18.4 | ||||||||
| pH | su | 6.5 - 8.5 | Range detected: 7.5 - 8.6 | Measure of acidity. Naturally present, adjusted in drinking water treatment. | ||||
| Sulfate | ppm | 250 | Average detected: 23.3 | Naturally present in the environment. | ||||
| Range detected: 4.61 - 55.3 | ||||||||
| Other Required Monitoring | Unit | Recommended Level | Likely Source of Contaminants | |||||
| Cryptosporidium | Second round of monitoring (over 48 month duration) was completed in 2017. Detections were found in source water only and were not detected at levels of concern; Cryptosporidium is a microbial pathogen found in surface water throughout the U.S. Although filtration removes cryptosporidium, the most commonly-used filtration methods cannot guarantee 100 percent removal. Our monitoring indicates the presence of these organisms in our source water. Current test methods do not allow us to determine if the organisms are dead or if they are capable of causing disease. Ingestion of cryptosporidium may cause cryptosporidiosis, an abdominal infection. Symptoms of infection include nausea, diarrhea, and abdominal cramps. Most healthy individuals can overcome the disease within a few weeks. However, immuno-compromised people are at greater risk of developing life-threatening illness. We encourage immuno-compromised individuals to consult their doctor regarding appropriate precautions to take to avoid infection. Cryptosporidium must be ingested to cause disease, and it may be spread through means other than drinking water. | |||||||
| Sodium | ppm | Standard has not been established. | Average detected: 10.4 | Naturally occurring, urban stormwater runoff or discharge from sewage treatment plants. | ||||
| Range detected: 8.30 - 12.7 | ||||||||
| UCMR5 Monitoring: The City of Tulsa has completed the Unregulated Contaminant Monitoring (UCMR5) in 2023, which required monitoring for Lithium and 29 Per- and Polyfluoroalkyl Substances (PFAS). Unregulated contaminants are those for which EPA has not established drinking water standards. The purpose of unregulated contaminant monitoring is to assist EPA in determining the occurrence of unregulated contaminants in drinking water and whether future regulation is warranted. Results indicate no detectable levels of PFAS and Lithium present in drinking water. | ||||||||
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