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	Annual Toxics Summary San Jose-4th Street FAQs Perchloroethylene 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		0.03	*	*	*	0.14	0.045	9	0.01	*
2001		0.01	0.04	*	0.08	0.18	0.034	28	0.01	*
2000		0.01	0.04	0.088	0.18	0.41	0.095	29	0.01	10
1999		0.01	0.04	*	0.14	0.26	0.064	22	0.01	*
1998		0.005	0.03	*	0.09	0.36	0.077	28	0.01	*
1997		0.005	0.04	0.096	0.28	0.52	0.119	27	0.01	11
1996		0.005	0.04	0.068	0.15	0.31	0.079	31	0.01	8
1995		0.02	0.05	0.069	0.15	0.35	0.070	30	0.01	8
1994		0.005	0.03	0.064	0.17	0.44	0.091	31	0.01	7
1993		0.01	0.06	0.094	0.25	0.31	0.088	30	0.01	11
1992		0.03	0.07	0.100	0.18	0.37	0.073	31	0.01	12
1991		0.04	0.12	0.153	0.30	0.41	0.098	28	0.01	18
1990		0.05	0.11	0.161	0.33	0.53	0.127	27	0.01	19
1989		0.06	0.12	0.217	0.48	0.92	0.227	23	0.01	25

	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.