toluene - National Park Service

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W.Human (Drinking Water and Other Human Concern Levels): EPA 1996 IRIS database information [893]: Maximum Contaminant Level Goal Value: 1 mg/L. Reference: 54 FR 22062 (05/22/89) [893]: Contact: Health and Ecological Criteria Division / (202)260-7571 Safe Drinking Water Hotline / (800)426-4791 Discussion: EPA has set a MCLG for <strong>toluene</strong> based on its potential adverse effects reported in a 13-week oral study in rats. The MCLG is based upon a DWEL of 7 mg/L and an assumed drinking water contribution of 20 percent. Older value: The U.S. EPA Maximum Contaminant Level Goal (MCLG) is 2.000 mg/L [859]. Maximum Contaminant Level (MCL) Value: 1 mg/L Status/Year: Final 1991 Reference: 56 FR 3526 (01/30/91); 56 FR 30266 (07/01/91) [893]. Older reference: Drinking Water MCL: 1,000 ug/L [446]. Contact: Drinking Water Standards Division / OGWDW / (202)260-7575 Safe Drinking Water Hotline / (800)426-4791 Ambient Water Quality Criteria for Human Health: For Water & Fish: 1.43E+4 ug/liter. Discussion: The WQC of 1.43E+4 ug/L is based on consumption of contaminated aquatic organisms and water [893]. Older reference to same value: Human Health (risk of one additional case in 1 million, 1E-06) Risk Level for Carcinogens: Published Criteria for Water and Organisms: 14,300 ug/L [446,689]. IRIS UPDATED (7/93) Criteria for Water and Organisms: 6,800 ug/L [689]. Older IRIS Recalculated (1990)
Criteria for Water and Organisms: 10,000 ug/L [928]. For Fish Only: 4.24E+5 ug/liter [893]. A WQC of 4.24E+5 ug/L has also been established based on consumption of contaminated aquatic organisms alone. Older reference to same value: Human Health (risk of one additional case in 1 million, 1E-06) Risk Level for Carcinogens: Published Criteria for Organisms Only: 424,000 [446,689]. Older yet IRIS Recalculated (7/93) Criteria for Organisms Only: 300,000 [928] Reference: 45 FR 79318 (11/28/80), Contact: Criteria and Standards Division / OWRS / (202)260-1315 NOTE: Before citing a concentration as EPA's water quality criteria, it is prudent to make sure you have the latest one. Work on the replacement for the Gold Book [302] was underway in March of 1996, and IRIS is updated monthly [893]. Taste threshold in water is reported as 0.04 and 1 mg/L. Odor threshold in water is reported as 0.04 and 1 mg/L. EPA Region IX 1995 Preliminary Remediation Goal (PRG) for tap water: 7.2E+02 ug/L [868]. Older information on drinking water standards: The aesthetic objective (AO) in Canada for <strong>toluene</strong> in drinking water is
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BIOLOGICAL MATERIALS [904]: Because
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