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	Annual Toxics Summary San Jose-4th Street FAQs Carbon Tetrachloride parts per billion

Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		*	*	*	*	*	*	0	*	*
2010		*	*	*	*	*	*	0	*	*
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		0.08	*	*	*	0.09	0.004	9	0.02	*
2001		0.08	0.09	*	0.10	0.11	0.008	28	0.02	*
2000		0.07	0.09	0.095	0.12	0.14	0.016	29	0.02	73
1999		0.08	0.08	*	0.12	0.13	0.018	15	0.02	*
1998		0.09	0.11	*	0.15	0.17	0.025	29	0.02	*
1997		0.08	0.11	*	0.12	0.13	0.012	20	0.02	*
1996		0.06	0.08	0.077	0.09	0.10	0.008	31	0.02	59
1995		0.07	0.10	0.102	0.11	0.13	0.010	30	0.02	78
1994		0.08	0.11	*	0.13	0.13	0.020	22	0.02	*
1993		0.08	0.11	0.107	0.13	0.15	0.016	27	0.02	82
1992		0.10	0.11	*	0.13	0.14	0.010	22	0.02	*
1991		0.11	0.13	0.128	0.14	0.16	0.012	28	0.02	99
1990		0.10	0.13	0.127	0.14	0.15	0.010	27	0.02	97
1989		0.09	0.11	0.115	0.14	0.15	0.015	23	0.02	88

	Notes:	Values below the Limit of Detection (LoD) assumed to be ½ LoD. Means and risks shown only for years with data in all 12 months. "*" means there was insufficient or no data available to determine the value.