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	Annual Toxics Summary Fremont-Chapel Way 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		0.005	0.02	*	0.06	0.10	0.027	17	0.01	*
2009		0.005	0.02	0.023	0.05	0.07	0.019	31	0.01	3
2008		0.005	0.02	0.078	0.06	2.0	0.356	31	0.01	9
2007		0.005	0.02	0.035	0.10	0.13	0.038	30	0.01	4
2006		0.005	0.02	0.024	0.05	0.12	0.023	29	0.01	3
2005		0.005	0.02	*	0.05	0.15	0.029	28	0.01	*
2004		0.005	0.02	0.029	0.07	0.11	0.026	30	0.01	3
2003		0.005	0.03	0.039	0.06	0.18	0.039	30	0.01	5
2002		0.01	0.04	0.050	0.09	0.16	0.035	28	0.01	6
2001		0.01	0.05	0.056	0.08	0.27	0.048	30	0.01	7
2000		0.03	0.07	0.083	0.20	0.23	0.059	29	0.01	10
1999		0.005	0.06	*	0.15	0.25	0.062	22	0.01	*
1998		0.005	0.05	*	0.12	0.86	0.156	30	0.01	*
1997		0.01	0.04	*	0.16	0.20	0.063	13	0.01	*
1996		0.01	0.06	0.069	0.11	0.21	0.043	31	0.01	8
1995		0.03	0.10	0.118	0.24	0.29	0.077	30	0.01	14
1994		0.005	0.07	0.086	0.17	0.29	0.072	31	0.01	10
1993		0.01	0.08	0.114	0.26	0.45	0.103	30	0.01	13
1992		0.03	0.10	0.134	0.27	0.63	0.119	30	0.01	15
1991		0.02	0.19	0.210	0.42	0.54	0.146	30	0.01	24
1990		0.04	0.14	0.189	0.40	0.55	0.137	30	0.01	22
1989		0.06	0.26	0.296	0.57	0.73	0.192	24	0.01	34

	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.