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	Annual Toxics Summary Bakersfield-5558 California Avenue 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	*	0.01	0.02	0.004	15	0.01	*
2022		0.005	0.005	0.010	0.02	0.03	0.006	29	0.01	1
2021		0.005	0.005	*	0.02	0.03	0.007	23	0.01	*
2020		0.005	*	*	*	0.03	0.007	7	0.01	*
2019		0.005	0.005	0.009	0.02	0.03	0.006	29	0.01	1
2018		0.005	0.005	0.007	0.01	0.06	0.009	36	0.01	0.9
2017		0.005	0.005	0.008	0.02	0.03	0.007	31	0.01	1
2016		0.005	0.01	0.031	0.04	0.38	0.069	31	0.01	4
2015		0.005	0.01	0.013	0.02	0.05	0.010	30	0.01	2
2014		0.005	0.02	*	0.04	0.07	0.015	16	0.01	*
2013		0.005	0.005	*	0.03	0.04	0.012	23	0.01	*
2012		0.005	0.01	0.014	0.03	0.08	0.015	33	0.01	2
2011		0.005	0.01	0.014	0.02	0.06	0.012	33	0.01	2
2010		0.005	0.02	0.018	0.03	0.05	0.012	30	0.01	2
2009		0.005	0.02	0.027	0.06	0.07	0.019	34	0.01	3
2008		0.005	0.02	0.046	0.13	0.33	0.072	33	0.01	5
2007		0.005	0.03	0.041	0.09	0.16	0.041	32	0.01	5
2006		0.005	0.04	0.056	0.09	0.29	0.060	30	0.01	7
2005		0.005	0.04	0.043	0.08	0.10	0.025	31	0.01	5
2004		0.005	0.04	*	0.07	0.09	0.023	25	0.01	*
2003		0.01	0.03	0.037	0.07	0.11	0.027	29	0.01	4
2002		0.01	0.04	0.047	0.08	0.11	0.025	30	0.01	5
2001		0.02	0.05	0.058	0.12	0.28	0.054	31	0.01	7
2000		0.005	0.04	0.065	0.12	0.24	0.050	30	0.01	8
1999		0.005	0.05	*	0.10	0.15	0.035	22	0.01	*
1998		0.005	0.03	*	0.10	0.21	0.049	28	0.01	*
1997		0.005	0.03	0.039	0.06	0.16	0.035	32	0.01	5
1996		0.005	0.03	0.119	0.22	1.5	0.264	32	0.01	14
1995		0.01	0.05	0.092	0.17	1.0	0.182	32	0.01	11
1994		0.005	0.03	*	0.12	0.33	0.072	23	0.01	*
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.