The Power of Information

National Drinking Water Database


Monterey Park-City, Water Dept. Utilities - Los Angeles, CA


Serves 57,000 people

Tetrachloroethylene

Tetrachloroethylene (perc) is a common soil and groundwater contaminant used in dry cleaning and as a solvent in automotive and metalworking factories and other industries.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
158 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
320 days
Tests ConductedNumber of individual tests done for this contaminant
5,075 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
TetrachloroethyleneTetrachloroethylene (perc) is a common soil and groundwater contaminant used in dry cleaning and as a solvent in automotive and metalworking factories and other industries.0.25 ppb
2.58 ppb
Yes
MCLGA non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.: 0 ppb
No
5 ppb
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.

Health Based and Legal Limits for Tetrachloroethylene

Health Based Limits for Tetrachloroethylene

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.0 ppb
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.0.06 ppb
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.0.69 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.5 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.10 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.500 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.2000 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.2000 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-03-240.09 ppb35330 to 2.5 ppb
2009-03-170.05 ppb36350 to 1.9 ppb
2009-03-100.06 ppb36350 to 2.1 ppb
2009-03-040.2 ppb19160 to 2.6 ppb
2009-03-030.04 ppb15140 to 0.55 ppb
2009-02-230.04 ppb35340 to 1.3 ppb
2009-02-200 ppb990 ppb
2009-02-190.07 ppb26250 to 1.9 ppb
2009-02-110.06 ppb26250 to 1.6 ppb
2009-02-100 ppb990 ppb
2009-02-040.07 ppb19180 to 1.4 ppb
2009-02-030.05 ppb16150 to 0.77 ppb
2009-01-270.03 ppb35340 to 0.97 ppb
2009-01-200.04 ppb35340 to 1.4 ppb
2009-01-160 ppb990 ppb
2009-01-130.04 ppb26250 to 1.1 ppb
2009-01-070 ppb770 ppb
2009-01-060.17 ppb27250 to 4 ppb
2008-12-300.27 ppb35330 to 5.7 ppb
2008-12-230.16 ppb35320 to 3.5 ppb
2008-12-190.31 ppb970 to 2.1 ppb
2008-12-160 ppb26260 ppb
2008-12-120.28 ppb970 to 1.9 ppb
2008-12-090.02 ppb26250 to 0.51 ppb
2008-12-050 ppb110 ppb
2008-12-040 ppb18180 ppb
2008-12-020.27 ppb16130 to 2.4 ppb
2008-11-240.14 ppb35330 to 3.6 ppb
2008-11-180.13 ppb35330 to 3.5 ppb
2008-11-100.08 ppb35330 to 2.1 ppb
2008-11-040.03 ppb35340 to 1.1 ppb
2008-10-280.07 ppb35340 to 2.4 ppb
2008-10-230.06 ppb35340 to 2 ppb
2008-10-140.04 ppb35340 to 1.5 ppb
2008-10-080 ppb770 ppb
2008-10-070.04 ppb28270 to 1.2 ppb
2008-10-010.03 ppb35340 to 1 ppb
2008-09-250.03 ppb28270 to 0.84 ppb
2008-09-230.08 ppb760 to 0.55 ppb
2008-09-160.02 ppb35340 to 0.58 ppb
2008-09-090 ppb35350 ppb
2008-09-030 ppb29290 ppb
2008-09-020 ppb660 ppb
2008-08-270 ppb35350 ppb
2008-08-180 ppb34340 ppb
2008-08-140 ppb14140 ppb
2008-08-130 ppb38380 ppb
2008-08-120 ppb18180 ppb
2008-08-070 ppb18180 ppb
2008-08-060.14 ppb32310 to 4.6 ppb
2008-08-050.21 ppb22200 to 4.1 ppb
2008-07-300.04 ppb14130 to 0.52 ppb
2008-07-290 ppb38380 ppb
2008-07-280 ppb18180 ppb
2008-07-230.04 ppb14130 to 0.54 ppb
2008-07-220 ppb56560 ppb
2008-07-160 ppb770 ppb
2008-07-150 ppb28280 ppb
2008-07-090 ppb880 ppb
2008-07-080 ppb37370 ppb
2008-07-020 ppb26260 ppb
2008-07-010 ppb990 ppb
2008-06-240 ppb35350 ppb
2008-06-170.04 ppb16150 to 0.6 ppb
2008-06-130 ppb990 ppb
2008-06-100 ppb26260 ppb
2008-06-050 ppb330 ppb
2008-06-030.28 ppb24230 to 6.6 ppb
2008-05-270.66 ppb28250 to 7.4 ppb
2008-05-211.16 ppb25200 to 7.4 ppb
2008-05-140.92 ppb34290 to 8.3 ppb
2008-05-060.65 ppb36310 to 6.1 ppb
2008-04-280.68 ppb35300 to 6.2 ppb
2008-04-220.78 ppb32270 to 6.2 ppb
2008-04-160 ppb550 ppb
2008-04-150.76 ppb28230 to 5.4 ppb
2008-04-080.72 ppb28230 to 5.5 ppb
2008-04-020.64 ppb28230 to 5 ppb
2008-03-250.38 ppb35300 to 3.8 ppb
2008-03-180.48 ppb28230 to 4.3 ppb
2008-03-120 ppb770 ppb
2008-03-040.32 ppb35280 to 2.6 ppb
2008-02-260.18 ppb35300 to 1.7 ppb
2008-02-210.2 ppb35300 to 2 ppb
2008-02-120.09 ppb35320 to 1.3 ppb
2008-02-050.12 ppb36310 to 1.5 ppb
2008-01-300.13 ppb35320 to 1.9 ppb
2008-01-220.12 ppb26230 to 1.4 ppb
2008-01-180 ppb990 ppb
2008-01-160 ppb770 ppb
2008-01-070.08 ppb36330 to 1.2 ppb
2008-01-030.07 ppb35320 to 0.99 ppb
2007-12-270 ppb16160 ppb
2007-12-190.1 ppb26230 to 1.1 ppb
2007-12-110 ppb990 ppb
2007-12-060.11 ppb28250 to 1.4 ppb
2007-11-270.09 ppb35320 to 1.4 ppb
2007-11-200 ppb990 ppb
2007-11-140.09 ppb36330 to 1.4 ppb
2007-11-060.09 ppb36330 to 1.3 ppb
2007-11-020 ppb990 ppb
2007-10-310.17 ppb19160 to 1.4 ppb
2007-10-300 ppb990 ppb
2007-10-220.14 ppb28250 to 1.6 ppb
2007-10-160.04 ppb28270 to 1.1 ppb
2007-10-090.08 ppb26240 to 1.5 ppb
2007-10-030 ppb880 ppb
2007-10-020 ppb16160 ppb
2007-09-250 ppb16160 ppb
2007-09-180.31 ppb35340 to 11 ppb
2007-09-110.04 ppb16150 to 0.6 ppb
2007-09-050.35 ppb36340 to 12 ppb
2007-08-280.34 ppb35330 to 11 ppb
2007-08-210.34 ppb35340 to 12 ppb
2007-08-140.39 ppb35330 to 13 ppb
2007-08-070.37 ppb35330 to 12 ppb
2007-08-030 ppb990 ppb
2007-08-010.43 ppb27250 to 11 ppb
2007-07-250.5 ppb27250 to 13 ppb
2007-07-200 ppb660 ppb
2007-07-170.62 ppb21200 to 13 ppb
2007-07-101.32 ppb18150 to 12 ppb
2007-07-030 ppb880 ppb
2007-07-022.44 ppb23170 to 12 ppb
2007-06-262.58 ppb24180 to 11 ppb
2007-06-250 ppb770 ppb
2007-06-220 ppb550 ppb
2007-06-202.32 ppb26190 to 11 ppb
2007-06-122.16 ppb26190 to 11 ppb
2007-06-051.7 ppb27200 to 8.7 ppb
2007-06-040 ppb550 ppb
2007-05-291.66 ppb28220 to 11 ppb
2007-05-221.62 ppb28230 to 10 ppb
2007-05-151.52 ppb28230 to 9.7 ppb
2007-05-081.38 ppb28230 to 9 ppb
2007-05-011.45 ppb29240 to 11 ppb
2007-04-241.16 ppb28230 to 8.6 ppb
2007-04-171.47 ppb28220 to 8.4 ppb
2007-04-101.23 ppb28220 to 7.2 ppb
2007-04-030.98 ppb29230 to 6.2 ppb
2007-03-280 ppb550 ppb
2007-03-271.08 ppb25190 to 6 ppb
2007-03-201.04 ppb25190 to 5.7 ppb
2007-03-131.05 ppb26200 to 6.8 ppb
2007-03-060.9 ppb27210 to 5.4 ppb
2007-03-010.96 ppb26200 to 6 ppb
2007-02-200.87 ppb26200 to 5.2 ppb
2007-02-130.77 ppb31250 to 5.4 ppb
2007-02-090 ppb550 ppb
2007-02-060.6 ppb34270 to 4.6 ppb
2007-01-300.62 ppb31250 to 4.6 ppb
2007-01-230.59 ppb31250 to 4.4 ppb
2007-01-160.65 ppb31240 to 4.4 ppb
2007-01-090.64 ppb34280 to 5.1 ppb
2007-01-030.77 ppb26200 to 4.5 ppb
2006-12-260.75 ppb26200 to 4.6 ppb
2006-12-190.7 ppb26200 to 4.3 ppb
2006-12-120.58 ppb26200 to 3.3 ppb
2006-12-050.49 ppb27210 to 3.1 ppb
2006-11-290.31 ppb25200 to 1.7 ppb
2006-11-210.5 ppb25190 to 2.6 ppb
2006-11-140.38 ppb32260 to 2.5 ppb
2006-11-100.6 ppb100.6 ppb
2006-11-090 ppb770 ppb
2006-11-070.77 ppb19130 to 3.2 ppb
2006-10-310.43 ppb27200 to 2.5 ppb
2006-10-240.41 ppb25190 to 2.3 ppb
2006-10-170.41 ppb20150 to 2 ppb
2006-10-100.5 ppb20130 to 2.4 ppb
2006-10-050 ppb110 ppb
2006-10-030.38 ppb20150 to 2.4 ppb
2006-10-020 ppb660 ppb
2006-09-260.45 ppb19120 to 2.2 ppb
2006-09-190.36 ppb27210 to 2.7 ppb
2006-09-120.43 ppb18130 to 1.9 ppb
2006-09-050.35 ppb18130 to 1.6 ppb
2006-08-310 ppb220 ppb
2006-08-290.38 ppb16110 to 1.6 ppb
2006-08-220.58 ppb1050 to 1.5 ppb
2006-08-150.43 ppb1050 to 1.1 ppb
2006-08-080.36 ppb1060 to 1 ppb
2006-08-030 ppb550 ppb
2006-08-010.46 ppb720 to 0.9 ppb
2006-07-250.32 ppb740 to 0.97 ppb
2006-07-180.17 ppb1290 to 0.8 ppb
2006-07-110.16 ppb1290 to 0.8 ppb
2006-07-030 ppb14140 ppb
2006-06-260 ppb12120 ppb
2006-06-200 ppb12120 ppb
2006-06-160 ppb880 ppb
2006-06-130 ppb12120 ppb
2006-06-060 ppb14140 ppb
2006-05-300 ppb13130 ppb
2006-05-220 ppb13130 ppb
2006-05-160 ppb13130 ppb
2006-05-110 ppb110 ppb
2006-05-090 ppb12120 ppb
2006-05-020 ppb22220 ppb
2006-04-250 ppb13130 ppb
2006-04-180 ppb13130 ppb
2006-04-110 ppb660 ppb
2006-04-040 ppb15150 ppb
2006-03-290 ppb110 ppb
2006-03-220 ppb110 ppb
2006-03-210 ppb330 ppb
2006-03-140.78 ppb1150 to 2 ppb
2006-03-080 ppb550 ppb
2006-03-070.59 ppb1590 to 2.1 ppb
2006-02-270.84 ppb1150 to 2.1 ppb
2006-02-210.86 ppb1150 to 2.5 ppb
2006-02-140.84 ppb1150 to 2.2 ppb
2006-02-070.46 ppb20140 to 2.1 ppb
2006-02-021.64 ppb710 to 2.7 ppb
2006-01-310 ppb880 ppb
2006-01-241.82 ppb1140 to 8.6 ppb
2006-01-170.76 ppb1160 to 1.9 ppb
2006-01-100.53 ppb1260 to 1.3 ppb
2006-01-060 ppb330 ppb
2006-01-040.83 ppb710 to 1.2 ppb
2005-12-280.66 ppb1030 to 1.2 ppb
2005-12-200.55 ppb1040 to 1.2 ppb
2005-12-130.53 ppb1040 to 1.2 ppb
2005-12-060.38 ppb1270 to 1.1 ppb
2005-11-290.44 ppb1050 to 1 ppb
2005-11-220.36 ppb1050 to 0.9 ppb
2005-11-150.35 ppb1050 to 0.9 ppb
2005-11-080.34 ppb840 to 0.8 ppb
2005-11-010.15 ppb20160 to 0.8 ppb
2005-10-270 ppb110 ppb
2005-10-250.28 ppb1060 to 0.8 ppb
2005-10-190.16 ppb1180 to 0.7 ppb
2005-10-100.32 ppb1160 to 0.8 ppb
2005-10-040.19 ppb20150 to 0.9 ppb
2005-09-270 ppb550 ppb
2005-09-210 ppb550 ppb
2005-09-130 ppb550 ppb
2005-09-070.25 ppb20140 to 1.1 ppb
2005-08-300 ppb220 ppb
2005-08-230 ppb220 ppb
2005-08-160 ppb220 ppb
2005-08-090 ppb220 ppb
2005-08-020.44 ppb1590 to 1.5 ppb
2005-07-260 ppb220 ppb
2005-07-190 ppb220 ppb
2005-07-120 ppb220 ppb
2005-07-050.22 ppb15110 to 1 ppb
2005-06-270 ppb220 ppb
2005-06-200 ppb220 ppb
2005-06-150 ppb990 ppb
2005-06-070 ppb880 ppb
2005-05-310 ppb220 ppb
2005-05-240 ppb220 ppb
2005-05-170 ppb220 ppb
2005-05-110 ppb220 ppb
2005-05-030 ppb880 ppb
2005-04-260 ppb220 ppb
2005-04-190 ppb220 ppb
2005-04-120 ppb220 ppb
2005-04-050 ppb880 ppb
2005-03-290 ppb220 ppb
2005-03-220 ppb220 ppb
2005-03-150 ppb220 ppb
2005-03-070 ppb220 ppb
2005-03-010 ppb880 ppb
2005-02-220 ppb220 ppb
2005-02-150 ppb220 ppb
2005-02-080 ppb220 ppb
2005-02-010 ppb880 ppb
2005-01-250 ppb220 ppb
2005-01-180 ppb220 ppb
2005-01-120 ppb110 ppb
2005-01-110 ppb110 ppb
2005-01-040 ppb880 ppb
2004-12-280 ppb220 ppb
2004-12-220 ppb110 ppb
2004-12-210 ppb110 ppb
2004-12-200 ppb110 ppb
2004-12-130 ppb220 ppb
2004-12-060 ppb770 ppb
2004-11-300 ppb110 ppb
2004-11-220 ppb220 ppb
2004-11-150 ppb220 ppb
2004-11-080 ppb220 ppb
2004-11-020 ppb880 ppb
2004-10-250 ppb220 ppb
2004-10-180 ppb220 ppb
2004-10-110 ppb220 ppb
2004-10-040 ppb770 ppb
2004-09-270 ppb220 ppb
2004-09-200 ppb220 ppb
2004-09-150 ppb220 ppb
2004-09-080 ppb880 ppb
2004-08-300 ppb220 ppb
2004-08-230 ppb220 ppb
2004-08-020 ppb550 ppb
2004-07-260 ppb220 ppb
2004-07-190 ppb110 ppb
2004-07-120 ppb110 ppb
2004-06-280 ppb110 ppb
2004-06-220 ppb110 ppb
2004-06-140 ppb110 ppb
2004-06-070 ppb110 ppb
2004-05-240 ppb110 ppb
2004-05-170 ppb110 ppb
2004-04-260 ppb220 ppb
2004-04-190 ppb220 ppb
2004-04-120 ppb880 ppb
2004-04-050 ppb220 ppb
2004-03-290 ppb220 ppb
2004-03-220 ppb220 ppb
2004-03-150 ppb220 ppb
2004-03-080 ppb220 ppb
2004-03-010 ppb880 ppb
2004-02-240 ppb220 ppb
2004-02-170 ppb220 ppb
2004-02-090 ppb880 ppb
2004-02-040 ppb220 ppb
2004-01-200 ppb110 ppb
2004-01-130 ppb110 ppb
2004-01-060 ppb110 ppb