Chromium (total)

City of Mesa

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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207

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	5.35 ppb	119	107	ND - 22.0 ppb
2014	0.716 ppb	8	6	ND - 3.10 ppb
2015	6.30 ppb	32	29	ND - 19.4 ppb
2016	11.5 ppb	2	1	ND - 23.0 ppb
2017	ND	1	0	ND
2018	8.40 ppb	30	29	ND - 22.6 ppb
2019	9.33 ppb	15	15	1.18 ppb - 21.0 ppb

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
2013-01-15	201301160556AM	3.20 ppb
2013-01-15	201301160548AM	2.00 ppb
2013-01-15	201301160554AM	4.10 ppb
2013-01-16	201301160558AM	2.40 ppb
2013-01-16	201301160560AM	ND
2013-01-16	201301160566AM	1.70 ppb
2013-01-16	201301160562AM	2.90 ppb
2013-01-16	201301160564AM	1.90 ppb
2013-01-22	201301240174AM	3.10 ppb
2013-01-22	201301240176AM	ND
2013-01-22	201301240152AM	3.20 ppb
2013-01-23	201301240195AM	1.70 ppb
2013-01-23	201301240197AM	1.000 ppb
2013-01-30	201301310433AM	6.10 ppb
2013-01-30	201301310431AM	1.000 ppb
2013-02-12	201302140551AM	7.20 ppb
2013-02-12	201302140549AM	1.30 ppb
2013-02-12	201302140542AM	6.30 ppb
2013-02-12	201302140544AM	8.90 ppb
2013-02-13	201302140538AM	0.290 ppb
2013-02-13	201302140540AM	3.70 ppb
2013-02-13	201302140535AM	7.40 ppb
2013-02-13	201302140531AM	2.50 ppb
2013-02-13	201302140529AM	3.80 ppb
2013-02-13	201302140533AM	4.30 ppb
2013-02-19	201302200371AM	9.40 ppb
2013-02-19	201302200375AM	8.50 ppb
2013-02-19	201302200373AM	8.00 ppb
2013-02-26	201302260119AM	7.80 ppb
2013-04-08	201304100491AM	ND
2013-04-09	201304100493AM	0.620 ppb
2013-04-09	201304100477AM	2.30 ppb
2013-04-09	201304100479AM	ND
2013-04-09	201304100481AM	ND
2013-04-10	201304110552AM	9.00 ppb
2013-04-10	201304110554AM	6.00 ppb
2013-04-10	201304110546AM	4.60 ppb
2013-04-10	201304110542AM	9.60 ppb
2013-04-10	201304110540AM	12.0 ppb
2013-04-10	201304110544AM	9.30 ppb
2013-04-16	201304170691AM	2.20 ppb
2013-04-17	201304170697AM	ND
2013-04-17	201304170699AM	ND
2013-04-17	201304170701AM	2.70 ppb
2013-04-17	201304170695AM	ND
2013-05-09	201305100040AM	17.0 ppb
2013-05-09	201305100042AM	21.0 ppb
2013-05-09	201305100038AM	17.0 ppb
2013-05-09	201305100044AM	12.0 ppb
2013-05-14	201305150463AM	1.60 ppb
2013-05-14	201305150465AM	3.50 ppb
2013-05-15	201305150520AM	2.10 ppb
2013-05-15	201305150518AM	15.0 ppb
2013-05-20	201305200188AM	10.00 ppb
2013-05-20	201305200190AM	8.70 ppb
2013-05-20	201305200068AM	4.20 ppb
2013-05-20	201305200127AM	11.0 ppb
2013-05-29	201305290453AM	11.0 ppb
2013-05-29	201305290411AM	6.30 ppb
2013-07-09	201307100757AM	0.300 ppb
2013-07-09	201307100755AM	7.30 ppb
2013-07-10	201307100761AM	0.270 ppb
2013-07-23	201307240533AM	0.260 ppb
2013-07-23	201307240535AM	5.90 ppb
2013-07-23	201307240531AM	0.240 ppb
2013-07-24	201307240537AM	5.30 ppb
2013-07-24	201307240544AM	5.70 ppb
2013-08-05	201308070778AM	ND
2013-08-05	201308070622AM	4.20 ppb
2013-08-05	201308070618AM	2.90 ppb
2013-08-05	201308070620AM	4.50 ppb
2013-08-05	201308070624AM	1.20 ppb
2013-08-06	201308070601AM	5.50 ppb
2013-08-06	201308070603AM	2.80 ppb
2013-08-06	201308070586AM	5.40 ppb
2013-08-06	201308070588AM	7.00 ppb
2013-08-06	201308070584AM	6.10 ppb
2013-08-07	201308070605AM	2.70 ppb
2013-08-07	201308070590AM	4.80 ppb
2013-08-12	201308130444AM	0.210 ppb
2013-08-12	201308130442AM	1.40 ppb
2013-08-12	201308130434AM	1.60 ppb
2013-08-12	201308130430AM	2.40 ppb
2013-08-12	201308130432AM	1.60 ppb
2013-08-13	201308140060AM	8.70 ppb
2013-08-13	201308140062AM	4.90 ppb
2013-08-14	201308140418AM	8.60 ppb
2013-08-14	201308140416AM	1.50 ppb
2013-08-14	201308140394AM	2.60 ppb
2013-08-14	201308140392AM	4.20 ppb
2013-10-08	201310080650AM	5.70 ppb
2013-10-08	201310080652AM	ND
2013-10-08	201310080610AM	14.0 ppb
2013-10-08	201310080612AM	12.0 ppb
2013-10-08	201310080614AM	18.0 ppb
2013-10-08	201310080616AM	18.0 ppb
2013-10-09	201310090517AM	8.40 ppb
2013-10-09	201310090515AM	1.30 ppb
2013-10-09	201310090511AM	2.50 ppb
2013-10-09	201310090513AM	10.00 ppb
2013-10-15	201310150507AM	3.40 ppb
2013-10-15	201310150505AM	ND
2013-10-15	201310150503AM	ND
2013-10-16	201310160477AM	3.80 ppb
2013-10-16	201310160475AM	0.290 ppb
2013-10-31	201310310439AM	1.20 ppb
2013-11-05	201311070309AM	6.30 ppb
2013-11-05	201311070311AM	0.330 ppb
2013-11-05	201311050403AM	5.10 ppb
2013-11-05	201311050401AM	13.0 ppb
2013-11-06	201311070313AM	7.50 ppb
2013-11-06	201311070298AM	22.0 ppb
2013-11-06	201311070294AM	20.0 ppb
2013-11-06	201311070300AM	11.0 ppb
2013-11-06	201311070296AM	16.0 ppb
2013-11-12	201311130338AM	3.40 ppb
2013-11-12	201311130336AM	4.40 ppb
2013-11-13	201311140713AM	5.80 ppb
2013-11-20	201311210516AM	0.220 ppb
2014-01-23	201401230427AM	ND
2014-03-25	201403250421AM	3.10 ppb
2014-03-25	201403250419AM	0.210 ppb
2014-06-17	201406180491AM	0.290 ppb
2014-07-15	201407160688AM	0.300 ppb
2014-09-02	201409020219AM	0.900 ppb
2014-09-02	201409020217AM	0.930 ppb
2014-10-08	14100297	ND
2015-01-21	201501220206AM	0.610 ppb
2015-01-21	201501220204AM	0.350 ppb
2015-04-07	15040249	ND
2015-04-07	15040272	5.53 ppb
2015-04-07	15040273	8.81 ppb
2015-04-14	15040400	4.86 ppb
2015-04-21	15040606	19.4 ppb
2015-04-28	15040768	5.64 ppb
2015-04-29	15040771	1.69 ppb
2015-04-29	15040772	1.50 ppb
2015-07-06	15070073	16.2 ppb
2015-07-06	15070074	17.8 ppb
2015-07-06	15070076	8.21 ppb
2015-07-06	15070077	7.04 ppb
2015-07-07	15070117	15.2 ppb
2015-07-07	15070119I	11.8 ppb
2015-07-07	15070120IOC	10.3 ppb
2015-07-13	15070247I	1.85 ppb
2015-07-13	15070249	5.78 ppb
2015-07-13	15070250	2.15 ppb
2015-07-13	15070251	14.6 ppb
2015-07-14	15070252I	4.24 ppb
2015-07-14	15070253	2.32 ppb
2015-07-14	15070254	5.43 ppb
2015-07-14	15070255	15.0 ppb
2015-07-20	15070391	5.33 ppb
2015-07-21	15070447	3.52 ppb
2015-07-21	15070448	3.81 ppb
2015-07-21	15070449	1.26 ppb
2015-07-21	15070450	1.40 ppb
2015-07-21	15070451	ND
2015-07-27	15070541	ND
2016-06-08	16060165I	23.0 ppb
2016-10-04	16100039	ND
2017-10-10	17100401	ND
2018-04-02	18030942	6.25 ppb
2018-04-04	18030948 IOC	4.72 ppb
2018-04-09	18040098	3.82 ppb
2018-04-09	18040100 IOC	3.32 ppb
2018-04-10	18040101	5.44 ppb
2018-04-16	18040220 IOC	4.98 ppb
2018-04-16	18040222 IOC	7.53 ppb
2018-04-17	18040223 IOC	2.94 ppb
2018-04-17	18040224	4.33 ppb
2018-04-24	18040502 IOC	6.73 ppb
2018-04-24	18040503 IOC	2.52 ppb
2018-04-24	18040504 IOC	5.22 ppb
2018-04-30	18040540 IOC	4.09 ppb
2018-05-10	18050425	6.83 ppb
2018-08-07	18080202 IOC	2.56 ppb
2018-10-11	18100452	13.1 ppb
2018-10-15	18100484	3.09 ppb
2018-10-15	18100506	6.40 ppb
2018-10-16	18100517	18.1 ppb
2018-10-16	18100519	21.6 ppb
2018-10-17	18100555 IOC	10.3 ppb
2018-10-17	18100557	22.6 ppb
2018-10-18	18100597	ND
2018-10-22	18100638	6.15 ppb
2018-10-22	18100640	9.25 ppb
2018-10-23	18100673	13.3 ppb
2018-10-24	18100681	14.4 ppb
2018-10-24	18100683	9.36 ppb
2018-10-29	18100752	15.6 ppb
2018-11-26	18110662 IOC	17.3 ppb
2019-03-27	19030655	7.54 ppb
2019-03-28	19030580	1.18 ppb
2019-04-08	19040180	6.57 ppb
2019-04-08	19040182	5.41 ppb
2019-04-10	19040260	7.31 ppb
2019-04-11	19040287	8.02 ppb
2019-04-15	19040331	9.55 ppb
2019-04-16	19040352	11.7 ppb
2019-04-16	19040354	3.99 ppb
2019-04-24	19040522	5.95 ppb
2019-08-05	19080019	2.76 ppb
2019-08-08	19080129	15.8 ppb
2019-08-15	19080280	19.7 ppb
2019-08-26	19080657	21.0 ppb
2019-09-19	19090600	13.4 ppb