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	Annual Toxics Summary San Jose-Jackson 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
2025		0.06	0.07	*	0.08	0.10	0.007	20	0.02	*
2024		0.07	0.08	0.079	0.09	0.11	0.008	29	0.02	61
2023		0.06	0.08	0.075	0.08	0.09	0.006	30	0.02	57
2022		0.05	0.07	0.063	0.07	0.08	0.009	30	0.02	49
2021		0.05	0.06	*	0.07	0.08	0.007	22	0.02	*
2020		0.07	*	*	*	0.08	0.005	9	0.02	*
2019		0.06	0.07	0.069	0.07	0.08	0.005	30	0.02	53
2018		0.06	0.07	0.073	0.09	0.09	0.008	29	0.02	56
2017		0.08	0.08	*	0.10	0.12	0.012	23	0.02	*
2016		0.04	0.09	0.093	0.11	0.13	0.016	31	0.02	72
2015		0.08	0.09	0.093	0.10	0.12	0.010	30	0.02	71
2014		0.07	0.10	0.095	0.10	0.11	0.009	29	0.02	73
2013		0.07	0.08	0.082	0.09	0.10	0.009	31	0.02	63
2012		0.07	0.08	0.083	0.09	0.10	0.006	29	0.02	64
2011		0.07	0.09	0.089	0.10	0.10	0.009	32	0.02	68
2010		0.07	0.09	0.085	0.10	0.10	0.007	28	0.02	66
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		0.07	*	*	*	0.08	0.006	3	0.02	*
2003		0.08	0.09	0.096	0.11	0.12	0.010	30	0.02	73
2002		0.08	*	*	*	0.09	0.005	6	0.02	*
2001		*	*	*	*	*	*	0	*	*
2000		*	*	*	*	*	*	0	*	*
1999		*	*	*	*	*	*	0	*	*
1998		*	*	*	*	*	*	0	*	*
1997		*	*	*	*	*	*	0	*	*
1996		*	*	*	*	*	*	0	*	*
1995		*	*	*	*	*	*	0	*	*
1994		*	*	*	*	*	*	0	*	*
1993		*	*	*	*	*	*	0	*	*
1992		*	*	*	*	*	*	0	*	*
1991		*	*	*	*	*	*	0	*	*
1990		*	*	*	*	*	*	0	*	*
1989		*	*	*	*	*	*	0	*	*

	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.