The Power of Information

National Drinking Water Database


Montezuma Muni Water Supply Utilities - Grinnell, IA


Serves 1,457 people

Chlorite

Chlorite is a disinfection byproduct resulting from water treatment with chlorine dioxide, or from the use of chlorine dioxide as a bleaching agent for cellulose, paper pulp, flour and oils.
 
This Drinking Water System
Test Days Exceeding Health GuidelinesDefinition of what this is
1 days
Test Days Exceeding Legal LimitsNumber of days in which the samples taken in that day exceed the Maximum Contaminant Level (Depending on the contaminant and its MCL, that may or may not trigger an MCL violation. Some MCLs are based on averages spanning several months to a year)
0 days
Test DaysNumber of days in which this chemical has reported results in the data we received from the State
64 days
Tests ConductedNumber of individual tests done for this contaminant
225 tests

Testing Summary

ContaminantAverage/
Maximum
Result
Health Limit
Exceeded
Legal Limit
Exceeded

Testing History

-Tested      -Detected      -Over Health Guidelines      -Over Legal Limit*
ChloriteChlorite is a disinfection byproduct resulting from water treatment with chlorine dioxide, or from the use of chlorine dioxide as a bleaching agent for cellulose, paper pulp, flour and oils.437.34 ppb
955 ppb
Yes
800 ppb
No
1000 ppb
NOTE: Each dot in the above graph represents one month.
* Water utilities are noted as exceeding the legal limit if any test is above the maximum contaminant level (MCL). Most MCLs are based on annual averages so exceeding the MCL for one test does not necessarily indicate that the system is out of compliance.

Health Based and Legal Limits for Chlorite

Health Based Limits for Chlorite

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.800 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.800 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.840 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.840 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.1000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.1000 ppb

Testing Results

Testing DateAverage
Result
Samples taken that dayNumber of Non-DetectsRange of Results
2009-06-01514.67 ppb30491 to 553 ppb
2009-05-04320 ppb30284 to 379 ppb
2009-04-06575 ppb30225 to 777 ppb
2009-03-02308.67 ppb30217 to 404 ppb
2009-02-02283 ppb30249 to 314 ppb
2009-01-05437.67 ppb30386 to 480 ppb
2008-12-02504.33 ppb30455 to 538 ppb
2008-11-03665 ppb30611 to 693 ppb
2008-10-14711.5 ppb20641 to 782 ppb
2008-10-13955 ppb10955 ppb
2008-09-02625.33 ppb30504 to 838 ppb
2008-08-04438.67 ppb30349 to 545 ppb
2008-07-07645 ppb30582 to 693 ppb
2008-06-02224.67 ppb310 to 339 ppb
2008-05-05463.67 ppb30351 to 630 ppb
2008-04-01294 ppb30152 to 409 ppb
2008-03-0340 ppb320 to 120 ppb
2008-02-04220 ppb30168 to 301 ppb
2008-01-07408 ppb30250 to 700 ppb
2007-12-04517.33 ppb60491 to 564 ppb
2007-11-07514.33 ppb60441 to 573 ppb
2007-10-02359.67 ppb60242 to 469 ppb
2007-09-05560.33 ppb60296 to 725 ppb
2007-08-07606.33 ppb60550 to 659 ppb
2007-07-10367.67 ppb60292 to 477 ppb
2007-06-05480.33 ppb60463 to 514 ppb
2007-05-22472 ppb60433 to 515 ppb
2007-04-03361.33 ppb60295 to 442 ppb
2007-03-06273.33 ppb60215 to 316 ppb
2007-02-06229.67 ppb60198 to 261 ppb
2007-01-09458.33 ppb60357 to 659 ppb
2006-12-12411 ppb30354 to 451 ppb
2006-11-060 pCi/L*330 ppb
2006-10-020 pCi/L*330 ppb
2006-09-050 pCi/L*330 ppb
2006-08-140 pCi/L*330 ppb
2006-07-10264.67 ppb30250 to 284 ppb
2006-06-05663.33 ppb30598 to 718 ppb
2006-05-08647 ppb30550 to 748 ppb
2006-04-05505.67 ppb30346 to 695 ppb
2006-03-06757.33 ppb30752 to 764 ppb
2006-02-06383 ppb30359 to 406 ppb
2006-01-03173 ppb30157 to 185 ppb
2005-12-05364 ppb30255 to 468 ppb
2005-11-21614 ppb30614 ppb
2005-10-03515.67 ppb30440 to 617 ppb
2005-09-0691 ppb310 to 146 ppb
2005-08-01591 ppb30553 to 643 ppb
2005-07-05418.67 ppb30416 to 420 ppb
2005-06-06442 ppb30418 to 465 ppb
2005-05-02640 ppb30520 to 760 ppb
2005-04-04370 ppb30340 to 420 ppb
2005-03-01436.67 ppb30350 to 500 ppb
2005-02-01476.67 ppb30380 to 650 ppb
2005-01-03540 ppb30540 ppb
2004-12-06700 ppb30680 to 720 ppb
2004-11-01600 ppb30540 to 640 ppb
2004-10-12426.67 ppb30300 to 520 ppb
2004-09-20336.67 ppb310 to 910 ppb
2004-08-160 ppb330 ppb
2004-07-06746.67 ppb30690 to 780 ppb
2004-06-07673.33 ppb30620 to 740 ppb
2004-05-03573.33 ppb30540 to 620 ppb
2004-04-05793.33 ppb30780 to 820 ppb