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EWG's Tap Water Database — 2021 UPDATE

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Chloroform

Ridgewood Water

Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Read More.

In addition to tap water disinfection, chloroform pollution in the environment also comes from industrial discharges from pulp and paper mills, and from urban wastewater effluent. Human studies show that chloroform damages the kidneys, liver and central nervous system. In animals, chloroform causes infertility, birth defects and cancer.

Click here to read more about disinfection byproducts.

 

905

Samples

0

Samples exceeding legal limit (MCL)

426

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.325 ppb26272ND - 8.89 ppb
20151.27 ppb126110ND - 20.6 ppb
20161.18 ppb160158ND - 11.2 ppb
20171.31 ppb130128ND - 16.6 ppb
20182.47 ppb1081080.251 ppb - 25.0 ppb
20192.33 ppb1191190.250 ppb - 36.7 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.4 ppb

The EWG Health Guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-074010141-010.270 ppb
2014-01-074010141-02ND
2014-01-074010141-060.440 ppb
2014-01-074010141-13ND
2014-01-074010141-15ND
2014-01-074010141-17ND
2014-01-074010141-09ND
2014-01-074010141-11ND
2014-01-074010141-18ND
2014-01-074010141-07ND
2014-01-214010529-01ND
2014-01-214010529-03ND
2014-01-214010529-130.430 ppb
2014-01-214010529-10ND
2014-01-214010529-11ND
2014-01-214010529-07ND
2014-01-214010529-09ND
2014-01-214010529-12ND
2014-01-214010529-05ND
2014-01-314020068-050.640 ppb
2014-01-314020068-060.540 ppb
2014-01-314020068-040.580 ppb
2014-01-314020068-020.760 ppb
2014-01-314020068-030.440 ppb
2014-01-314020068-010.660 ppb
2014-02-044020067-030.290 ppb
2014-02-044020067-07ND
2014-02-044020067-090.320 ppb
2014-02-044020067-15ND
2014-02-044020067-16ND
2014-02-044020067-12ND
2014-02-044020067-14ND
2014-02-044020067-18ND
2014-02-044020067-10ND
2014-02-184020345-010.260 ppb
2014-02-184020345-03ND
2014-02-184020345-120.270 ppb
2014-02-184020345-10ND
2014-02-184020345-07ND
2014-02-184020345-09ND
2014-02-184020345-11ND
2014-02-184020345-05ND
2014-03-044030100-01ND
2014-03-044030100-03ND
2014-03-044030100-050.260 ppb
2014-03-044030100-11ND
2014-03-044030100-12ND
2014-03-044030100-08ND
2014-03-044030100-10ND
2014-03-044030100-14ND
2014-03-044030100-06ND
2014-03-184030458-01ND
2014-03-184030458-03ND
2014-03-184030458-10ND
2014-03-184030458-07ND
2014-03-184030458-09ND
2014-03-184030458-11ND
2014-03-184030458-050.530 ppb
2014-04-014040049-01ND
2014-04-014040049-030.500 ppb
2014-04-014040049-180.500 ppb
2014-04-014040049-14ND
2014-04-014040049-10ND
2014-04-014040049-06ND
2014-04-014040049-080.320 ppb
2014-04-014040049-19ND
2014-04-014040049-04ND
2014-04-154040521-01ND
2014-04-154040521-080.490 ppb
2014-04-154040521-05ND
2014-04-154040521-07ND
2014-04-154040521-09ND
2014-04-154040521-03ND
2014-04-294040877-01ND
2014-04-294040877-04ND
2014-04-294040877-130.410 ppb
2014-04-294040877-10ND
2014-04-294040877-12ND
2014-04-294040877-14ND
2014-04-294040877-08ND
2014-05-024050212-056.58 ppb
2014-05-024050212-062.78 ppb
2014-05-024050212-044.84 ppb
2014-05-024050212-022.29 ppb
2014-05-024050212-03ND
2014-05-024050212-010.460 ppb
2014-05-134050455-01ND
2014-05-134050455-03ND
2014-05-134050455-050.370 ppb
2014-05-134050455-11ND
2014-05-134050455-120.450 ppb
2014-05-134050455-08ND
2014-05-134050455-10ND
2014-05-134050455-14ND
2014-05-134050455-06ND
2014-05-274050800-01ND
2014-05-274050800-050.290 ppb
2014-05-274050800-08ND
2014-05-274050800-210.570 ppb
2014-05-274050800-04ND
2014-05-274050800-03ND
2014-05-274050800-15ND
2014-05-274050800-16ND
2014-05-274050800-14ND
2014-05-274050800-20ND
2014-05-274050800-10ND
2014-05-294050852-050.420 ppb
2014-05-294050852-02ND
2014-06-104060344-050.270 ppb
2014-06-104060344-01ND
2014-06-104060344-03ND
2014-06-104060344-060.300 ppb
2014-06-104060344-09ND
2014-06-104060344-07ND
2014-06-244060776-01ND
2014-06-244060776-03ND
2014-06-244060776-10ND
2014-06-244060776-07ND
2014-06-244060776-09ND
2014-06-244060776-12ND
2014-06-244060776-14ND
2014-06-244060776-05ND
2014-07-074070293-01ND
2014-07-074070293-070.510 ppb
2014-07-074070293-03ND
2014-07-074070293-080.350 ppb
2014-07-074070293-090.710 ppb
2014-07-074070293-16ND
2014-07-074070293-18ND
2014-07-074070293-21ND
2014-07-074070293-200.400 ppb
2014-07-074070293-12ND
2014-07-074070293-14ND
2014-07-074070293-26ND
2014-07-074070293-29ND
2014-07-074070293-10ND
2014-07-224070751-03ND
2014-07-224070751-10ND
2014-07-224070751-010.560 ppb
2014-07-224070751-020.290 ppb
2014-07-224070751-12ND
2014-07-224070751-18ND
2014-07-224070751-190.340 ppb
2014-07-224070751-15ND
2014-07-224070751-17ND
2014-07-224070751-23ND
2014-07-224070751-210.560 ppb
2014-07-224070751-200.610 ppb
2014-07-224070751-25ND
2014-07-224070751-13ND
2014-08-014080208-057.59 ppb
2014-08-014080208-068.89 ppb
2014-08-014080208-041.03 ppb
2014-08-014080208-020.310 ppb
2014-08-014080208-03ND
2014-08-014080208-010.840 ppb
2014-08-054080209-01ND
2014-08-054080209-03ND
2014-08-054080209-050.380 ppb
2014-08-054080209-11ND
2014-08-054080209-12ND
2014-08-054080209-14ND
2014-08-054080209-08ND
2014-08-054080209-10ND
2014-08-054080209-16ND
2014-08-054080209-18ND
2014-08-054080209-06ND
2014-08-194080651-01ND
2014-08-194080651-03ND
2014-08-194080651-09ND
2014-08-194080651-07ND
2014-08-194080651-11ND
2014-08-194080651-13ND
2014-08-194080651-05ND
2014-08-264080840-010.460 ppb
2014-09-024090050-01ND
2014-09-024090050-03ND
2014-09-024090050-050.320 ppb
2014-09-024090050-10ND
2014-09-024090050-11ND
2014-09-024090050-13ND
2014-09-024090050-08ND
2014-09-024090050-15ND
2014-09-024090050-170.320 ppb
2014-09-024090050-06ND
2014-09-164090486-010.380 ppb
2014-09-164090486-03ND
2014-09-164090486-07ND
2014-09-164090486-05ND
2014-09-164090486-09ND
2014-09-164090486-11ND
2014-09-304100028-01ND
2014-09-304100028-03ND
2014-09-304100028-07ND
2014-09-304100028-05ND
2014-09-304100028-09ND
2014-09-304100028-11ND
2014-10-134100463-010.340 ppb
2014-10-134100463-070.370 ppb
2014-10-134100463-03ND
2014-10-134100463-080.340 ppb
2014-10-134100463-090.710 ppb
2014-10-134100463-14ND
2014-10-134100463-16ND
2014-10-134100463-19ND
2014-10-134100463-181.03 ppb
2014-10-134100463-12ND
2014-10-134100463-24ND
2014-10-134100463-27ND
2014-10-134100463-10ND
2014-10-284100860-120.360 ppb
2014-10-284100860-110.360 ppb
2014-10-284100860-130.550 ppb
2014-10-284100860-01ND
2014-10-284100860-060.410 ppb
2014-10-284100860-04ND
2014-10-284100860-250.460 ppb
2014-10-284100860-26ND
2014-10-284100860-21ND
2014-10-284100860-19ND
2014-10-284100860-23ND
2014-10-284100860-17ND
2014-11-034110315-058.17 ppb
2014-11-034110315-065.80 ppb
2014-11-034110315-047.85 ppb
2014-11-034110315-021.27 ppb
2014-11-034110315-031.01 ppb
2014-11-034110315-010.659 ppb
2014-11-064110312-01ND
2014-11-104110313-07ND
2014-11-104110313-09ND
2014-11-104110313-110.370 ppb
2014-11-104110313-03ND
2014-11-104110313-04ND
2014-11-104110313-06ND
2014-11-104110313-01ND
2014-11-104110313-15ND
2014-11-104110313-12ND
2014-11-254110688-010.426 ppb
2014-11-254110688-03ND
2014-11-254110688-100.371 ppb
2014-11-254110688-07ND
2014-11-254110688-090.419 ppb
2014-11-254110688-12ND
2014-11-254110688-05ND
2014-12-084120262-01ND
2014-12-084120262-03ND
2014-12-084120262-040.415 ppb
2014-12-084120262-10ND
2014-12-084120262-11ND
2014-12-084120262-13ND
2014-12-084120262-07ND
2014-12-084120262-15ND
2014-12-084120262-05ND
2014-12-114120282-01ND
2014-12-234120589-01ND
2014-12-234120589-03ND
2014-12-234120589-10ND
2014-12-234120589-07ND
2014-12-234120589-09ND
2014-12-234120589-12ND
2014-12-234120589-05ND
2015-01-055010094-01ND
2015-01-055010094-060.318 ppb
2015-01-055010094-03ND
2015-01-055010094-070.336 ppb
2015-01-055010094-14ND
2015-01-055010094-19ND
2015-01-055010094-10ND
2015-01-055010094-12ND
2015-01-055010094-24ND
2015-01-055010094-08ND
2015-01-065010094-16ND
2015-01-065010094-180.405 ppb
2015-01-205010445-01ND
2015-01-205010445-10ND
2015-01-205010445-130.254 ppb
2015-01-205010445-06ND
2015-01-205010445-08ND
2015-01-205010445-17ND
2015-01-205010445-04ND
2015-02-025020053-050.565 ppb
2015-02-025020053-062.32 ppb
2015-02-025020053-041.02 ppb
2015-02-025020053-020.746 ppb
2015-02-025020053-030.316 ppb
2015-02-025020053-010.532 ppb
2015-02-035020049-150.360 ppb
2015-02-175020383-010.285 ppb
2015-03-035030097-030.329 ppb
2015-04-015040061-070.311 ppb
2015-04-015040061-080.276 ppb
2015-04-015040061-190.482 ppb
2015-05-045050193-053.15 ppb
2015-05-045050193-063.15 ppb
2015-05-045050193-042.56 ppb
2015-05-045050193-022.19 ppb
2015-05-045050193-030.255 ppb
2015-05-045050193-011.39 ppb
2015-05-055050192-010.252 ppb
2015-05-055050192-050.413 ppb
2015-05-055050192-030.298 ppb
2015-05-055050192-090.513 ppb
2015-05-055050192-230.284 ppb
2015-05-055050192-250.285 ppb
2015-05-125050322-040.331 ppb
2015-05-195050583-010.468 ppb
2015-05-195050583-030.335 ppb
2015-05-195050583-090.252 ppb
2015-06-025060108-010.364 ppb
2015-06-025060108-030.512 ppb
2015-06-025060108-060.417 ppb
2015-06-025060108-050.336 ppb
2015-06-185060587-010.414 ppb
2015-06-185060587-030.284 ppb
2015-06-185060587-070.331 ppb
2015-07-075070236-010.466 ppb
2015-07-075070236-070.526 ppb
2015-07-075070236-030.398 ppb
2015-07-075070236-080.539 ppb
2015-07-075070236-090.534 ppb
2015-07-075070236-140.314 ppb
2015-07-075070236-160.565 ppb
2015-07-075070236-220.290 ppb
2015-07-075070236-250.452 ppb
2015-07-215070741-030.596 ppb
2015-07-215070741-010.804 ppb
2015-07-215070741-020.496 ppb
2015-07-215070741-160.891 ppb
2015-07-215070741-150.809 ppb
2015-07-215070741-200.279 ppb
2015-08-035080135-0214.3 ppb
2015-08-035080135-0113.9 ppb
2015-08-035080135-0320.6 ppb
2015-08-035080135-0417.5 ppb
2015-08-035080135-055.92 ppb
2015-08-035080135-07ND
2015-08-035080135-061.28 ppb
2015-08-035080135-082.23 ppb
2015-08-045080136-010.348 ppb
2015-08-045080136-060.355 ppb
2015-08-045080136-050.599 ppb
2015-08-045080136-110.306 ppb
2015-08-045080136-130.280 ppb
2015-08-045080136-090.278 ppb
2015-08-045080136-150.292 ppb
2015-08-045080136-170.536 ppb
2015-08-185080633-010.514 ppb
2015-08-185080633-080.309 ppb
2015-08-185080633-070.285 ppb
2015-08-185080633-100.262 ppb
2015-08-185080633-120.474 ppb
2015-09-015090110-010.458 ppb
2015-09-015090110-050.527 ppb
2015-09-015090110-080.254 ppb
2015-09-015090110-141.81 ppb
2015-09-035090163-010.456 ppb
2015-09-155090444-010.436 ppb
2015-10-055100203-010.477 ppb
2015-10-055100203-070.446 ppb
2015-10-055100203-080.480 ppb
2015-10-065100203-090.408 ppb
2015-10-065100203-181.17 ppb
2015-10-195100668-130.803 ppb
2015-10-195100668-030.467 ppb
2015-10-195100668-060.993 ppb
2015-10-195100668-080.512 ppb
2015-10-195100668-240.310 ppb
2015-10-205100668-120.368 ppb
2015-10-205100668-070.336 ppb
2015-10-205100668-200.316 ppb
2015-11-025110011-023.45 ppb
2015-11-025110011-012.44 ppb
2015-11-025110011-036.08 ppb
2015-11-025110011-045.58 ppb
2015-11-025110011-054.47 ppb
2015-11-025110011-072.50 ppb
2015-11-025110011-061.67 ppb
2015-11-025110011-082.33 ppb
2015-11-035110131-010.365 ppb
2015-11-035110131-050.361 ppb
2015-11-165110570-010.336 ppb
2015-11-165110570-051.58 ppb
2015-11-175110570-150.402 ppb
2015-12-015120063-010.385 ppb
2015-12-015120063-050.374 ppb
2015-12-015120063-120.290 ppb
2015-12-295120773-010.608 ppb
2016-01-046010078-011.86 ppb
2016-01-046010078-030.321 ppb
2016-01-046010078-171.07 ppb
2016-01-056010078-070.512 ppb
2016-01-056010078-080.440 ppb
2016-01-056010078-090.506 ppb
2016-01-196010490-030.423 ppb
2016-01-196010490-010.603 ppb
2016-01-196010490-120.780 ppb
2016-01-196010490-090.302 ppb
2016-01-196010490-130.539 ppb
2016-01-206010482-031.17 ppb
2016-01-206010482-010.474 ppb
2016-02-016020121-021.47 ppb
2016-02-016020121-011.72 ppb
2016-02-016020121-031.32 ppb
2016-02-016020121-041.24 ppb
2016-02-016020121-051.96 ppb
2016-02-016020121-071.39 ppb
2016-02-016020121-061.43 ppb
2016-02-016020121-080.932 ppb
2016-02-026020120-050.357 ppb
2016-02-166020459-070.376 ppb
2016-02-166020459-010.356 ppb
2016-03-016030089-050.424 ppb
2016-03-016030089-080.360 ppb
2016-03-016030089-110.269 ppb
2016-03-156030554-010.264 ppb
2016-03-156030554-03ND
2016-03-156030554-05ND
2016-03-156030554-070.402 ppb
2016-03-156030554-080.261 ppb
2016-03-286030961-010.606 ppb
2016-04-046040186-010.345 ppb
2016-04-046040102-010.341 ppb
2016-04-046040186-150.306 ppb
2016-04-056040186-210.422 ppb
2016-04-056040186-250.425 ppb
2016-04-056040186-282.28 ppb
2016-04-056040186-262.36 ppb
2016-04-056040186-270.914 ppb
2016-04-196040630-010.276 ppb
2016-04-196040629-070.303 ppb
2016-04-196040630-070.370 ppb
2016-05-026050170-025.72 ppb
2016-05-026050170-016.10 ppb
2016-05-026050170-035.84 ppb
2016-05-026050170-045.76 ppb
2016-05-026050170-054.35 ppb
2016-05-026050170-072.21 ppb
2016-05-026050170-061.10 ppb
2016-05-026050170-083.29 ppb
2016-05-036050166-100.293 ppb
2016-05-036050166-040.445 ppb
2016-05-036050166-010.324 ppb
2016-05-046050372-031.06 ppb
2016-05-176050599-010.259 ppb
2016-05-176050599-080.259 ppb
2016-05-256050840-010.353 ppb
2016-05-266050840-030.858 ppb
2016-06-076060263-150.302 ppb
2016-06-076060263-120.434 ppb
2016-06-136060388-020.284 ppb
2016-06-216060678-010.333 ppb
2016-06-216060678-080.459 ppb
2016-06-216060678-100.295 ppb
2016-06-296070015-010.405 ppb
2016-07-056070118-010.412 ppb
2016-07-056070118-070.476 ppb
2016-07-056070118-080.415 ppb
2016-07-056070118-090.462 ppb
2016-07-056070118-140.328 ppb
2016-07-056070118-160.537 ppb
2016-07-056070118-190.268 ppb
2016-07-056070118-180.792 ppb
2016-07-056070118-240.251 ppb
2016-07-056070118-270.371 ppb
2016-07-066070105-022.98 ppb
2016-07-066070105-040.519 ppb
2016-07-066070105-050.564 ppb
2016-07-066070105-030.932 ppb
2016-07-066070105-010.682 ppb
2016-07-066070105-061.17 ppb
2016-07-186070570-030.666 ppb
2016-07-186070570-070.321 ppb
2016-07-186070570-090.322 ppb
2016-07-186070570-110.347 ppb
2016-07-186070570-140.472 ppb
2016-07-186070570-160.634 ppb
2016-07-196070570-120.793 ppb
2016-08-016080118-027.95 ppb
2016-08-016080118-016.36 ppb
2016-08-016080118-0311.2 ppb
2016-08-016080118-0410.7 ppb
2016-08-016080118-055.91 ppb
2016-08-016080118-070.508 ppb
2016-08-016080118-061.68 ppb
2016-08-016080118-082.05 ppb
2016-08-016080119-010.673 ppb
2016-08-016080119-030.328 ppb
2016-08-016080119-090.446 ppb
2016-08-016080119-060.260 ppb
2016-08-016080119-080.287 ppb
2016-08-016080119-140.308 ppb
2016-08-016080119-170.435 ppb
2016-08-026080119-050.536 ppb
2016-08-026080119-100.312 ppb
2016-08-026080119-120.367 ppb
2016-08-156080591-010.519 ppb
2016-08-156080591-053.37 ppb
2016-08-156080591-130.306 ppb
2016-09-066090171-010.420 ppb
2016-09-066090171-050.432 ppb
2016-09-066090171-100.313 ppb
2016-09-066090171-120.365 ppb
2016-09-066090171-130.492 ppb
2016-09-156090583-011.43 ppb
2016-09-156090583-020.346 ppb
2016-09-206090582-010.558 ppb
2016-09-206090582-080.307 ppb
2016-09-206090582-090.436 ppb
2016-10-036100124-010.373 ppb
2016-10-036100124-070.474 ppb
2016-10-036100124-090.530 ppb
2016-10-036100124-181.44 ppb
2016-10-036100124-270.504 ppb
2016-10-046100124-080.344 ppb
2016-10-046100124-190.332 ppb
2016-10-046100124-240.260 ppb
2016-10-076100214-110.854 ppb
2016-10-076100214-100.639 ppb
2016-10-076100214-121.15 ppb
2016-10-076100214-050.803 ppb
2016-10-076100214-130.392 ppb
2016-10-076100214-010.653 ppb
2016-10-176100566-010.436 ppb
2016-10-176100566-080.326 ppb
2016-10-176100566-070.366 ppb
2016-10-176100566-100.326 ppb
2016-10-176100566-130.513 ppb
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