Chromium (total)

Utilities Inc. - North Park Water Supply

Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	2	ND
2015	N/A	0	N/A
2016	ND	10	ND
2017	ND	2	ND
2018	N/A	0	N/A
2019	ND	12	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 100 ppb

The legal limit for total chromium, established in 1991, was based on a 1958 toxicity study in laboratory animals, and applies to both the less-toxic trivalent chromium and the more-toxic hexavalent chromium forms of this compound. This limit does not protect against the risk of cancer from ingestion of hexavalent chromium.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-02-19	AD89203	ND
2014-02-19	AD89203	ND
2016-05-17	AE06354	ND
2016-05-17	AE06350	ND
2016-05-17	AE06366	ND
2016-05-17	AE06362	ND
2016-05-17	AE06358	ND
2016-05-17	AE06350	ND
2016-05-17	AE06354	ND
2016-05-17	AE06358	ND
2016-05-17	AE06362	ND
2016-05-17	AE06366	ND
2017-01-23	AE12899	ND
2017-01-23	AE12899	ND
2019-02-26	B1900784-001	ND
2019-02-26	B1900784-005	ND
2019-02-26	B1900784-004	ND
2019-02-26	B1900784-003	ND
2019-02-26	B1900784-002	ND
2019-02-26	B1900784-001	ND
2019-02-26	B1900784-005	ND
2019-02-26	B1900784-004	ND
2019-02-26	B1900784-003	ND
2019-02-26	B1900784-002	ND
2019-10-15	B1904643-001	ND
2019-10-15	B1904643-001	ND