The Power of Information

National Drinking Water Database


City of Fresno Water Division Utilities - Fresno, CA


Serves 390,350 people

Chloroform

Chloroform is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
0 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
384 days
Tests ConductedNumber of individual tests done for this contaminant
2,149 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
ChloroformChloroform is a disinfection byproduct from the trihalomethane (THM) family, and is formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water.0.05 ppb
5 ppb
No
5.7 ppb
No
80 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 Chloroform

Health Based Limits for Chloroform

StandardDescriptionLevel
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.5.7 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.35 ppb
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.70 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.70 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.80 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.4000 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.4000 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-04-060 ppb220 ppb
2009-04-020 ppb110 ppb
2009-03-300 ppb110 ppb
2009-03-240 ppb110 ppb
2009-03-090 ppb660 ppb
2009-03-060.24 ppb540 to 1.2 ppb
2009-03-040 ppb440 ppb
2009-03-030 ppb770 ppb
2009-02-110 ppb440 ppb
2009-02-100 ppb660 ppb
2009-02-090.47 ppb640 to 1.7 ppb
2009-02-020 ppb770 ppb
2009-01-120 ppb440 ppb
2009-01-080.09 ppb17160 to 1.6 ppb
2009-01-070 ppb220 ppb
2008-12-190 ppb110 ppb
2008-12-180 ppb110 ppb
2008-12-100 ppb770 ppb
2008-12-090 ppb660 ppb
2008-12-030.15 ppb11100 to 1.6 ppb
2008-11-210 ppb110 ppb
2008-11-180 ppb110 ppb
2008-11-130 ppb660 ppb
2008-11-071.3 ppb101.3 ppb
2008-11-060.11 ppb12110 to 1.3 ppb
2008-11-050 ppb550 ppb
2008-11-040.37 ppb320 to 1.1 ppb
2008-10-240 ppb330 ppb
2008-10-090 ppb660 ppb
2008-10-080 ppb550 ppb
2008-10-070 ppb13130 ppb
2008-09-170 ppb11110 ppb
2008-09-080 ppb660 ppb
2008-09-030 ppb550 ppb
2008-08-270 ppb110 ppb
2008-08-260 ppb110 ppb
2008-08-110 ppb15150 ppb
2008-08-070 ppb550 ppb
2008-07-170 ppb110 ppb
2008-07-140 ppb660 ppb
2008-07-070 ppb550 ppb
2008-07-020 ppb660 ppb
2008-07-010 ppb12120 ppb
2008-06-130 ppb440 ppb
2008-06-100 ppb660 ppb
2008-06-060 ppb220 ppb
2008-06-050 ppb440 ppb
2008-06-020 ppb12120 ppb
2008-05-280 ppb220 ppb
2008-05-090 ppb550 ppb
2008-05-080 ppb18180 ppb
2008-04-280 ppb550 ppb
2008-04-210 ppb550 ppb
2008-04-160 ppb110 ppb
2008-04-150 ppb330 ppb
2008-04-140 ppb110 ppb
2008-04-080 ppb660 ppb
2008-04-040.11 ppb15140 to 1.6 ppb
2008-04-010 ppb770 ppb
2008-03-190 ppb330 ppb
2008-03-180 ppb11110 ppb
2008-03-170 ppb12120 ppb
2008-03-140 ppb550 ppb
2008-03-130.1 ppb15140 to 1.5 ppb
2008-03-120 ppb10100 ppb
2008-03-110 ppb17170 ppb
2008-03-100 ppb110 ppb
2008-03-060 ppb660 ppb
2008-03-040 ppb110 ppb
2008-02-290 ppb220 ppb
2008-02-280.16 ppb1090 to 1.6 ppb
2008-02-270.14 ppb980 to 1.3 ppb
2008-02-260 ppb990 ppb
2008-02-250 ppb10100 ppb
2008-02-220.26 ppb870 to 2.1 ppb
2008-02-211.9 ppb1090 to 19 ppb
2008-02-200 ppb880 ppb
2008-02-190 ppb10100 ppb
2008-02-150 ppb440 ppb
2008-02-140 ppb10100 ppb
2008-02-130 ppb880 ppb
2008-02-120 ppb12120 ppb
2008-02-115 ppb430 to 20 ppb
2008-02-080 ppb10100 ppb
2008-02-070 ppb10100 ppb
2008-02-060.1 ppb20190 to 2 ppb
2008-02-050 ppb110 ppb
2008-02-040 ppb220 ppb
2008-01-150 ppb110 ppb
2008-01-140 ppb660 ppb
2008-01-090 ppb660 ppb
2008-01-040.26 ppb760 to 1.8 ppb
2008-01-030 ppb13130 ppb
2007-12-120 ppb660 ppb
2007-12-110 ppb110 ppb
2007-12-070.26 ppb540 to 1.3 ppb
2007-12-060 ppb660 ppb
2007-12-050 ppb770 ppb
2007-11-200 ppb330 ppb
2007-11-150 ppb110 ppb
2007-11-140.38 ppb430 to 1.5 ppb
2007-11-080 ppb880 ppb
2007-11-070 ppb990 ppb
2007-10-310 ppb110 ppb
2007-10-050 ppb110 ppb
2007-10-040 ppb990 ppb
2007-10-030.09 ppb15140 to 1.4 ppb
2007-09-140 ppb110 ppb
2007-09-130.43 ppb320 to 1.3 ppb
2007-09-120 ppb990 ppb
2007-09-100 ppb770 ppb
2007-09-070 ppb220 ppb
2007-09-050 ppb330 ppb
2007-08-300 ppb110 ppb
2007-08-280 ppb110 ppb
2007-08-210 ppb330 ppb
2007-08-140 ppb110 ppb
2007-08-130 ppb330 ppb
2007-08-080 ppb110 ppb
2007-08-070 ppb660 ppb
2007-08-060 ppb660 ppb
2007-08-020 ppb770 ppb
2007-07-120 ppb990 ppb
2007-07-110 ppb440 ppb
2007-07-100 ppb11110 ppb
2007-07-030 ppb660 ppb
2007-06-260 ppb220 ppb
2007-06-130 ppb220 ppb
2007-06-080 ppb110 ppb
2007-06-060 ppb770 ppb
2007-06-050 ppb990 ppb
2007-05-300 ppb220 ppb
2007-05-220 ppb220 ppb
2007-05-180 ppb550 ppb
2007-05-170 ppb220 ppb
2007-05-100 ppb330 ppb
2007-05-030 ppb330 ppb
2007-05-020 ppb330 ppb
2007-05-010 ppb660 ppb
2007-04-190 ppb110 ppb
2007-04-130 ppb110 ppb
2007-04-060.26 ppb540 to 1.3 ppb
2007-04-040 ppb220 ppb
2007-04-030 ppb10100 ppb
2007-04-020 ppb330 ppb
2007-03-270 ppb220 ppb
2007-03-260 ppb110 ppb
2007-03-210 ppb220 ppb
2007-03-140 ppb220 ppb
2007-03-130 ppb440 ppb
2007-03-120.33 ppb430 to 1.3 ppb
2007-03-090 ppb110 ppb
2007-03-070 ppb220 ppb
2007-03-060 ppb660 ppb
2007-03-050 ppb330 ppb
2007-02-200 ppb330 ppb
2007-02-140 ppb330 ppb
2007-02-070 ppb660 ppb
2007-02-050 ppb330 ppb
2007-02-020.23 ppb650 to 1.4 ppb
2007-02-010 ppb770 ppb
2007-01-290 ppb330 ppb
2007-01-220 ppb330 ppb
2007-01-170 ppb330 ppb
2007-01-100 ppb660 ppb
2007-01-080 ppb330 ppb
2007-01-050.6 ppb210 to 1.2 ppb
2007-01-040 ppb770 ppb
2007-01-030 ppb770 ppb
2006-12-260 ppb330 ppb
2006-12-220 ppb220 ppb
2006-12-180 ppb330 ppb
2006-12-140 ppb660 ppb
2006-12-110 ppb330 ppb
2006-12-070 ppb660 ppb
2006-12-060.18 ppb650 to 1.1 ppb
2006-12-040 ppb330 ppb
2006-11-100 ppb660 ppb
2006-11-020 ppb880 ppb
2006-11-010 ppb770 ppb
2006-10-160 ppb220 ppb
2006-10-110 ppb660 ppb
2006-10-060 ppb220 ppb
2006-10-040 ppb11110 ppb
2006-10-030 ppb220 ppb
2006-10-020 ppb220 ppb
2006-09-210 ppb440 ppb
2006-09-150 ppb770 ppb
2006-09-130 ppb110 ppb
2006-09-080 ppb330 ppb
2006-09-070 ppb880 ppb
2006-08-150 ppb330 ppb
2006-08-140 ppb330 ppb
2006-08-100 ppb11110 ppb
2006-08-090 ppb330 ppb
2006-08-030 ppb770 ppb
2006-07-250 ppb110 ppb
2006-07-120 ppb330 ppb
2006-07-100 ppb660 ppb
2006-07-060 ppb770 ppb
2006-07-050 ppb12120 ppb
2006-06-290 ppb220 ppb
2006-06-270 ppb220 ppb
2006-06-200 ppb550 ppb
2006-06-120 ppb11110 ppb
2006-06-080 ppb110 ppb
2006-06-060 ppb16160 ppb
2006-06-020 ppb330 ppb
2006-05-310 ppb110 ppb
2006-05-300 ppb220 ppb
2006-05-260 ppb110 ppb
2006-05-240 ppb220 ppb
2006-05-230 ppb330 ppb
2006-05-150 ppb550 ppb
2006-05-100 ppb660 ppb
2006-05-080 ppb550 ppb
2006-05-030 ppb110 ppb
2006-05-020.1 ppb15130 to 0.82 ppb
2006-05-010 ppb220 ppb
2006-04-250 ppb220 ppb
2006-04-240 ppb330 ppb
2006-04-180 ppb330 ppb
2006-04-170 ppb220 ppb
2006-04-130 ppb660 ppb
2006-04-120 ppb330 ppb
2006-04-060 ppb990 ppb
2006-04-050.33 ppb630 to 0.86 ppb
2006-03-130 ppb660 ppb
2006-03-070 ppb110 ppb
2006-03-030.62 ppb100.62 ppb
2006-03-020.06 ppb14130 to 0.85 ppb
2006-02-240 ppb110 ppb
2006-02-070 ppb770 ppb
2006-02-030 ppb330 ppb
2006-02-020.16 ppb1180 to 0.74 ppb
2006-01-130 ppb660 ppb
2006-01-040.15 ppb1190 to 0.89 ppb
2006-01-030 ppb550 ppb
2005-12-080 ppb330 ppb
2005-12-070 ppb660 ppb
2005-12-060 ppb220 ppb
2005-12-020.08 ppb1090 to 0.75 ppb
2005-12-010 ppb330 ppb
2005-11-090 ppb880 ppb
2005-11-070.15 ppb650 to 0.92 ppb
2005-11-040 ppb330 ppb
2005-10-050 ppb14140 ppb
2005-10-040 ppb990 ppb
2005-09-280 ppb330 ppb
2005-09-270 ppb550 ppb
2005-09-210 ppb220 ppb
2005-09-140 ppb220 ppb
2005-09-130 ppb110 ppb
2005-09-070.04 ppb16150 to 0.6 ppb
2005-09-060.16 ppb430 to 0.62 ppb
2005-09-020 ppb330 ppb
2005-08-300 ppb220 ppb
2005-08-250 ppb330 ppb
2005-08-180 ppb220 ppb
2005-08-100 ppb880 ppb
2005-08-030 ppb880 ppb
2005-08-020 ppb13130 ppb
2005-07-270 ppb330 ppb
2005-07-210 ppb220 ppb
2005-07-200 ppb110 ppb
2005-07-190 ppb330 ppb
2005-07-150 ppb220 ppb
2005-07-130.08 ppb980 to 0.76 ppb
2005-07-110 ppb110 ppb
2005-07-070 ppb440 ppb
2005-07-060.09 ppb14120 to 0.74 ppb
2005-06-300 ppb440 ppb
2005-06-220 ppb220 ppb
2005-06-210 ppb220 ppb
2005-06-170 ppb330 ppb
2005-06-150 ppb660 ppb
2005-06-060 ppb550 ppb
2005-06-030 ppb110 ppb
2005-06-020 ppb11110 ppb
2005-05-250 ppb220 ppb
2005-05-240 ppb110 ppb
2005-05-180 ppb660 ppb
2005-05-160 ppb220 ppb
2005-05-090 ppb220 ppb
2005-05-060.08 ppb16140 to 0.79 ppb
2005-05-040 ppb220 ppb
2005-04-290 ppb110 ppb
2005-04-260 ppb220 ppb
2005-04-250 ppb220 ppb
2005-04-150 ppb220 ppb
2005-04-110 ppb660 ppb
2005-04-060.08 ppb14120 to 0.66 ppb
2005-03-220 ppb110 ppb
2005-03-170 ppb110 ppb
2005-03-160 ppb110 ppb
2005-03-150.21 ppb640 to 0.67 ppb
2005-03-020 ppb440 ppb
2005-03-010.15 ppb13100 to 0.7 ppb
2005-02-160 ppb660 ppb
2005-02-090 ppb220 ppb
2005-02-030 ppb110 ppb
2005-02-020.06 ppb980 to 0.54 ppb
2005-02-010 ppb550 ppb
2005-01-140 ppb660 ppb
2005-01-050.56 ppb310 to 1.1 ppb
2005-01-040.05 ppb11100 to 0.57 ppb
2004-12-160 ppb660 ppb
2004-12-140 ppb220 ppb
2004-12-060.08 ppb16140 to 0.7 ppb
2004-12-010 ppb110 ppb
2004-11-180 ppb110 ppb
2004-11-170 ppb440 ppb
2004-11-160 ppb19190 ppb
2004-11-150.08 ppb14130 to 1.1 ppb
2004-11-120 ppb660 ppb
2004-11-100 ppb15150 ppb
2004-11-090.06 ppb15140 to 0.89 ppb
2004-11-040 ppb440 ppb
2004-11-030 ppb14140 ppb
2004-11-020.03 ppb27260 to 0.76 ppb
2004-10-290 ppb110 ppb
2004-10-280 ppb550 ppb
2004-10-270.18 ppb15130 to 2.2 ppb
2004-10-260 ppb880 ppb
2004-10-220 ppb14140 ppb
2004-10-210 ppb14140 ppb
2004-10-190 ppb660 ppb
2004-10-150 ppb550 ppb
2004-10-140 ppb16160 ppb
2004-10-130 ppb22220 ppb
2004-10-120 ppb19190 ppb
2004-10-080 ppb110 ppb
2004-10-050.04 ppb15140 to 0.64 ppb
2004-09-160 ppb330 ppb
2004-09-150 ppb110 ppb
2004-09-140 ppb220 ppb
2004-09-130 ppb660 ppb
2004-09-020.03 ppb15140 to 0.51 ppb
2004-08-110 ppb660 ppb
2004-08-040 ppb14140 ppb
2004-07-230 ppb110 ppb
2004-07-200 ppb220 ppb
2004-07-140 ppb660 ppb
2004-07-080 ppb770 ppb
2004-07-070 ppb880 ppb
2004-06-160 ppb220 ppb
2004-06-100 ppb660 ppb
2004-06-090 ppb440 ppb
2004-06-080 ppb770 ppb
2004-06-040.16 ppb870 to 1.3 ppb
2004-05-250 ppb220 ppb
2004-05-210 ppb220 ppb
2004-05-170 ppb660 ppb
2004-05-120 ppb330 ppb
2004-05-070 ppb660 ppb
2004-05-060 ppb110 ppb
2004-05-050.07 ppb980 to 0.61 ppb
2004-05-030 ppb110 ppb
2004-04-270 ppb220 ppb
2004-04-260 ppb330 ppb
2004-04-201.3 ppb210 to 2.6 ppb
2004-04-190 ppb330 ppb
2004-04-160 ppb440 ppb
2004-04-120 ppb330 ppb
2004-04-070 ppb660 ppb
2004-04-050 ppb330 ppb
2004-04-010.05 ppb15140 to 0.73 ppb
2004-03-160 ppb660 ppb
2004-03-100 ppb660 ppb
2004-03-090 ppb110 ppb
2004-03-030 ppb330 ppb
2004-03-020.19 ppb1080 to 1.2 ppb
2004-03-010 ppb660 ppb
2004-02-230 ppb660 ppb
2004-02-190 ppb660 ppb
2004-02-110 ppb660 ppb
2004-02-030 ppb330 ppb
2004-02-020.16 ppb16130 to 1.1 ppb
2004-01-270 ppb660 ppb
2004-01-200 ppb660 ppb
2004-01-130 ppb660 ppb
2004-01-080 ppb660 ppb
2004-01-060.19 ppb1080 to 1.4 ppb
2004-01-050 ppb220 ppb