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2023 Regulated Contaminants Results

Your water met or exceeded all state and federal drinking water health standards

This report provides a snapshot of last year's water quality. EWEB is proud to say that we have never violated a maximum contaminant level or any other water quality standard established by the EPA. Learn more about EWEB's drinking water monitoring program. 

The following regulated contaminants were detected in the water. Review the comprehensive list of all the contaminants that EWEB tested for in 2023. 

Inorganics

Test MCL MCLG Detection Range Probable Source In Compliance?
Barium (ppm) 2 2 ND - 0.002 Erosion of natural deposits Yes
Nitrate 10 10 ND - 0.25 Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits Yes

Disinfection Byproducts

Test MCL MCLG Detection Range Probable Source In Compliance?
Total Trihalomethanes (ppb) 80 n/a

8.2 - 15.8

Highest LRAA = 13.0

 Byproduct of drinking water disinfection  Yes
Haloacetic Acids 60 n/a 3.5 - 10.1 Highest LRAA = 6.1 By product of drinking water disinfection Yes
Chlorine (ppm) 4 4 0.15 - 0.84 Added to control microbes Yes
Total Organic Carbon TT n/a 0.31 - 0.80 Naturally present in the environment Yes

Microbiological

Test MCL MCLG Detection Range Probable Source In Compliance?
Turbidity (NTU) TT<0.3 95% of the time n/a Highest result - 0.057 Soil run-off Yes

Copper and lead sampling results

The state requires EWEB to collect samples from 50 high-risk residential water taps once every three years. The following table represents our most recent testing results from 2021.

Contaminant Action Level MCLG 90th Percentile Result Samples Exceeding Action Level Source of Contaminant
Copper (ppm) 1.3 1.3 0.065 0 Corrosion of the household plumbing systems
Lead (ppb) 15 0 2.8 0

Learn more about lead and how it could get into your drinking water.

Notes on EWEB detected contaminants

The following provides additional information about the contaminants that were detected:

Chlorine

EWEB adds chlorine to our water during the disinfection process to protect against microorganisms such as Giardia and E.coli.

Copper

Copper is found in natural deposits and is also widely used in household plumbing materials

Turbidity

Turbidity is a meausre of the cloudiness of water. It can interfere with disinfection. EWEB's filtration process effectively removes turbidity.

Barium

This naturally-occuring substances, found in the mineral composition of our watershed, was detected at extremely low levels - well below regulatory standards.


Total Organic Carbon

A measure of naturally-occuring organic materials in water.

Disinfection Byproducts (DBPs)

Disinfectants are an essential element in drinking water treatment because of the barrier they provide against waterborne disease-causing microorganisms. DBPs form when disinfectants used to treat drinking water react with naturally-occuring materials in the water (e.g., decomposing plant and other organic material).

Nitrate

Nitrate is an essential component of living things and occurs naturally in surface and groundwater at concentrations up to 1-2 mg/L. At these naturally-occuring levels, nitrate is not harmful to health.

Definitions and abbreviations

Nephelometric Turbidity Units (NTU)

A measure of water clarity.

90th Percentile Value

This means that 90% of the samples collected were equal to or below the value reported.

n/a

Non-Applicable

ND

Contaminant not detectable using current monitoring equipment or methods.

ppb

Parts Per Billion

One part per billion corresponds to one penny in $10,000,000 or approximately one minute in 2,000 years.

Maximum Contaminant Level (MCL)

The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLG as feasible using the best available treatment technology.

Maximum Contaminant Level Goal(MCLGs)

The highest 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.

ppm

Parts Per Million. One part per million corresponds to one penny in $10,000 or approximately one minute in two years.

Highest Locational Running Average (LRAA)

The highest calculated average of multiple results at a single location in a 12-month period.

Action Level (AL)

The concentration of a contaminant which, if exceeded, triggers treatment

Treatment Technique (TT)

A required process intended to reduce the level of a contaminant in drinking water.

Eugene Water & Electric Board

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Mailing Address: 4200 Roosevelt Blvd., Eugene, OR 97402
Phone: 541-685-7000
Toll free: 800-841-5871
Email: eweb.answers@eweb.org
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