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	Annual Toxics Summary San Jose-Jackson 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		0.005	0.005	*	0.005	0.01	0.002	20	0.01	*
2022		0.005	0.005	0.007	0.01	0.02	0.003	30	0.01	0.8
2021		0.005	0.005	*	0.01	0.03	0.005	22	0.01	*
2020		0.005	*	*	*	0.02	0.004	9	0.01	*
2019		0.005	0.005	0.006	0.005	0.04	0.006	30	0.01	0.7
2018		0.005	0.005	0.009	0.02	0.04	0.008	31	0.01	1
2017		0.005	0.005	0.010	0.02	0.06	0.012	28	0.01	1
2016		0.005	0.01	0.016	0.03	0.04	0.011	31	0.01	2
2015		0.005	0.01	0.021	0.05	0.10	0.023	30	0.01	2
2014		0.005	0.02	0.024	0.05	0.08	0.017	29	0.01	3
2013		0.005	0.02	0.022	0.05	0.07	0.019	31	0.01	3
2012		0.005	0.02	0.022	0.05	0.07	0.017	29	0.01	3
2011		0.01	0.03	0.035	0.06	0.13	0.028	32	0.01	4
2010		0.005	0.02	0.028	0.06	0.09	0.020	30	0.01	3
2009		0.005	0.02	0.036	0.06	0.16	0.032	31	0.01	4
2008		0.005	0.02	0.027	0.05	0.11	0.020	31	0.01	3
2007		0.005	0.02	0.028	0.08	0.14	0.030	30	0.01	3
2006		0.01	0.03	0.029	0.05	0.08	0.018	30	0.01	3
2005		0.005	0.03	0.032	0.07	0.10	0.026	31	0.01	4
2004		0.005	0.02	0.037	0.08	0.14	0.035	30	0.01	4
2003		0.005	0.03	0.040	0.09	0.14	0.037	31	0.01	5
2002		0.02	*	*	*	0.15	0.058	6	0.01	*
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.