EWG Tap Water Database 2009

	This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is	8 days
Test Days Exceeding Legal LimitsNumber of days in which the samples taken in that day exceed the Maximum Contaminant Level (Depending on the contaminant and its MCL, that may or may not trigger an MCL violation. Some MCLs are based on averages spanning several months to a year)	0 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State	9 days
Tests ConductedNumber of individual tests done for this contaminant	59 tests

This Drinking Water System

Test Days Exceeding Health GuidelinesDefinition of what this is

8 days

Test Days Exceeding Legal LimitsNumber of days in which the samples taken in that day exceed the Maximum Contaminant Level (Depending on the contaminant and its MCL, that may or may not trigger an MCL violation. Some MCLs are based on averages spanning several months to a year)

0 days

Test DaysNumber of days in which this chemical has reported results in the data we received from the State

9 days

Tests ConductedNumber of individual tests done for this contaminant

59 tests

Contaminant	Average/ Maximum Result	Health Limit Exceeded	Legal Limit Exceeded	Testing History -Tested -Detected -Over Health Guidelines -Over Legal Limit*
RadonRadon is a radioactive breakdown product of radium and uranium in soil, rock and water; it is often present in groundwater.	206.34 pCi/L 276.67 pCi/L	Yes 1.5 pCi/L	Legal at any levelThis is the Federal Limit. State Limits may be lower.
NOTE: Each dot in the above graph represents one month. * Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Contaminant

Average/
Maximum
Result

Health Limit
Exceeded

Legal Limit
Exceeded

Testing History

-Tested

-Detected

-Over Health Guidelines

-Over Legal Limit*

RadonRadon is a radioactive breakdown product of radium and uranium in soil, rock and water; it is often present in groundwater.

206.34 pCi/L
276.67 pCi/L

Yes
1.5 pCi/L

Legal at any levelThis is the Federal Limit. State Limits may be lower.

NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Standard

Description

Level

One in one million (10-6) Cancer Risk

The concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.

1.5 pCi/L

One in ten thousand (10-4) Cancer Risk

The concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.

150 pCi/L

Testing Date

Average
Result

Samples taken that day

Number of Non-Detects

Range of Results

2004-09-02

0 pCi/L

2004-08-23

276.67 pCi/L

240 to 320 pCi/L

2004-08-12

262.5 pCi/L

220 to 290 pCi/L

2004-08-11

235 pCi/L

150 to 280 pCi/L

2004-08-10

247.5 pCi/L

160 to 310 pCi/L

2004-08-09

248 pCi/L

230 to 270 pCi/L

2004-08-04

238.88 pCi/L

200 to 271 pCi/L

2004-08-03

211 pCi/L

120 to 270 pCi/L

2004-08-02

137.5 pCi/L

0 to 280 pCi/L

National Drinking Water Database

Las Vegas Valley Water District Utilities - Las Vegas, NV

Radon

Testing Summary

Testing History

Health Based and Legal Limits for Radon

Health Based Limits for Radon

Testing Results

Health/Toxics

Farming

Natural Resources

Energy Choices