The Power of Information

National Drinking Water Database


Baltimore City Department of Public Works Utilities - Baltimore, MD


Serves 1,600,000 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
109 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
109 days
Tests ConductedNumber of individual tests done for this contaminant
455 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.34.84 ppb
74.8 ppb
Yes
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
2007-11-1928.67 ppb6021 to 39 ppb
2007-11-1834 ppb1034 ppb
2007-11-1629.5 ppb6020 to 36 ppb
2007-11-1430.5 ppb6021 to 42 ppb
2007-09-1939 ppb2034 to 44 ppb
2007-09-1841.5 ppb2036 to 47 ppb
2007-09-1745 ppb3039 to 52 ppb
2007-09-1444.36 ppb11034 to 65 ppb
2007-07-1945 ppb6042 to 48 ppb
2007-07-1833.5 ppb2020 to 47 ppb
2007-07-1730.5 ppb2018 to 43 ppb
2007-07-1633.17 ppb6021 to 46 ppb
2007-05-1633 ppb3032 to 34 ppb
2007-05-1538.5 ppb2030 to 47 ppb
2007-05-1432.67 ppb6024 to 38 ppb
2007-05-1132.33 ppb6026 to 38 ppb
2007-03-2917.67 ppb3012 to 22 ppb
2007-03-2128 ppb3018 to 37 ppb
2007-03-2042 ppb2022 to 62 ppb
2007-03-1925.17 ppb6016 to 41 ppb
2007-03-1628.4 ppb5019 to 49 ppb
2007-02-0231 ppb1031 ppb
2007-01-2426 ppb2022 to 30 ppb
2007-01-2324.5 ppb2022 to 27 ppb
2007-01-2225.17 ppb6016 to 32 ppb
2007-01-1926.6 ppb5022 to 29 ppb
2006-11-2236 ppb1036 ppb
2006-11-2132.33 ppb3028 to 36 ppb
2006-11-2040.67 ppb6039 to 48 ppb
2006-11-1734.67 ppb6024 to 42 ppb
2006-09-2052.33 ppb3047 to 56 ppb
2006-09-1949.5 ppb2046 to 53 ppb
2006-09-1846.33 ppb6037 to 55 ppb
2006-09-1552 ppb6040 to 67 ppb
2006-08-1649.5 ppb2041 to 58 ppb
2006-08-1562 ppb2056 to 68 ppb
2006-08-1452.33 ppb6037 to 68 ppb
2006-08-1155.6 ppb5047 to 72 ppb
2006-07-1965.33 ppb3053 to 86 ppb
2006-07-1860.5 ppb2057 to 64 ppb
2006-07-1760.57 ppb7030 to 77 ppb
2006-07-1452.25 ppb4048 to 55 ppb
2006-05-1726 ppb3026 ppb
2006-05-1627 ppb3021 to 33 ppb
2006-05-1530 ppb6025 to 37 ppb
2006-05-1222.8 ppb5019 to 30 ppb
2006-03-2228.5 ppb2020 to 37 ppb
2006-03-2124.5 ppb2024 to 25 ppb
2006-03-2019.5 ppb6016 to 23 ppb
2006-03-1719.83 ppb6014 to 24 ppb
2006-03-1223 ppb1023 ppb
2006-01-2320.33 ppb6017 to 31 ppb
2006-01-2022 ppb6015 to 27 ppb
2006-01-1819 ppb4017 to 21 ppb
2006-01-1732.5 ppb2023 to 42 ppb
2005-11-1638 ppb3029 to 43 ppb
2005-11-1537.5 ppb2037 to 38 ppb
2005-11-1428.5 ppb602 to 46 ppb
2005-11-1143.5 ppb8034 to 55 ppb
2005-09-2135.25 ppb4027 to 43 ppb
2005-09-2036 ppb2029 to 43 ppb
2005-09-1935.33 ppb6027 to 45 ppb
2005-09-1634 ppb6023 to 40 ppb
2005-07-2070.25 ppb4058 to 85 ppb
2005-07-1972 ppb2064 to 80 ppb
2005-07-1871.33 ppb6057 to 83 ppb
2005-07-1574.8 ppb5056 to 84 ppb
2005-06-2434 ppb5023 to 47 ppb
2005-06-2236.6 ppb5029 to 59 ppb
2005-06-2125.5 ppb2025 to 26 ppb
2005-06-2031.67 ppb6022 to 44 ppb
2005-03-2315.5 ppb6012 to 23 ppb
2005-03-2215.57 ppb7013 to 25 ppb
2005-03-2113 ppb502 to 21 ppb
2005-02-2820 ppb4016 to 28 ppb
2005-02-2523.13 ppb8012 to 49 ppb
2005-02-2313.25 ppb4012 to 15 ppb
2005-02-2219.67 ppb3014 to 25 ppb
2005-01-2621.67 ppb6017 to 30 ppb
2005-01-2418 ppb1018 ppb
2005-01-1921.67 ppb3014 to 31 ppb
2005-01-1819 ppb2018 to 20 ppb
2004-11-1837 ppb1037 ppb
2004-11-1737.2 ppb5021 to 52 ppb
2004-11-1640 ppb6022 to 60 ppb
2004-11-1535.83 ppb6026 to 42 ppb
2004-09-2239.67 ppb3025 to 51 ppb
2004-09-2145 ppb2037 to 53 ppb
2004-09-2040.83 ppb6030 to 50 ppb
2004-09-1745.63 ppb8032 to 58 ppb
2004-07-2144.75 ppb4033 to 57 ppb
2004-07-2048 ppb2046 to 50 ppb
2004-07-1952.6 ppb5040 to 69 ppb
2004-07-1642.14 ppb7028 to 56 ppb
2004-07-1326.25 ppb2023.6 to 28.9 ppb
2004-07-0943 ppb1043 ppb
2004-05-1928.33 ppb3023 to 33 ppb
2004-05-1828 ppb3026 to 30 ppb
2004-05-1731.8 ppb5024 to 45 ppb
2004-05-1429.25 ppb8020 to 38 ppb
2004-03-2431.25 ppb4026 to 42 ppb
2004-03-2333 ppb2033 ppb
2004-03-2231.5 ppb4025 to 44 ppb
2004-03-1930.22 ppb9019 to 48 ppb
2004-01-2820 ppb3018 to 22 ppb
2004-01-2718.67 ppb3015 to 22 ppb
2004-01-2624 ppb4017 to 32 ppb
2004-01-2325.8 ppb5015 to 51 ppb
2004-01-0620.15 ppb2019.8 to 20.5 ppb