Indicator Gauge Icon Legend
Legend Colors
Red is bad, green is good, blue is not statistically different/neutral.
Compared to Distribution
the value is in the best half of communities.
the value is in the 2nd worst quarter of communities.
the value is in the worst quarter of communities.
Compared to Target
meets target; 
does not meet target.
Compared to a Single Value
lower than the comparison value;
higher than the comparison value;
not statistically different from comparison value.
Trend
non-significant change over time; 
significant change over time; 
no change over time.
Compared to Prior Value
higher than the previous measurement period;
lower than the previous measurement period;
no statistically different change from previous measurement period.
Significantly better than the overall value
Significantly worse than the overall value
No significant difference with the overall value
No data on significance available
Trihalomethanes (TTHM)s Contaminants in Drinking Water
This indicator is archived and is no longer being updated. Click to learn more
Trihalomethanes (TTHMs) micrograms in one liter of water (ug/L) concentration in Truckee Meadows Water Authority (TMWA) drinking water.
The Maximum Contaminant Level (MCL) acceptable for human consumption is less than 80 micrograms per liter (ug/L). The level of trihalomethanes (TTHM)s is consistently well below the MCL set by the EPA for safe drinking water.
Trihalomethanes are disinfection by-products formed during the conventional drinking water treatment process, when used to control germs or chemicals in source water that would otherwise cause disease.
TMWA is required by federal, state and local water regulations to monitor and meet regulatory standards for more than one hundred contaminants. All water delivered to its customers is treated and has been in compliance with all EPA (Environmental Protection Agency) and State of Nevada standards and regulations.
For more information on contaminants in drinking water, visit TMWA
Why is this important?
Safe, reliable and high quality drinking water is essential and an environmental determinant of health.
TMWA is a member of the Partnership for Safe Water, implementing prevention programs where legislation and regulation does not exist, to increase drinking water protection against microbial contamination.
To better understand disinfection by-products and the Safe Water System visit: https://www.epa.gov/dwreginfo/stage-1-and-stage-2-disinfectants-and-disinfection-byproducts-rules
Measurement period: 2023
Maintained by: Truckee Meadows Tomorrow
Last update: June 2024
The maximum level of this graph is set at 80 ug/L, which is the MCL (Maximum Contaminant Level) set by the EPA.
Graph Selections
Data Source
- Truckee Meadows Water Authority
Note: This source uses Zip Code Tabulation Areas (ZCTAs) for its Zip Code data. Learn more
Maintained By: Truckee Meadows Tomorrow
Filed under: Environmental Health / Toxins & Contaminants