Fluoride (40 CFR 141.62(b)(1))

(corresponding with Section 611.301(b))

October 2, 1987

Phase I VOCs (40 CFR 141.61(a)(1) through (a)(8))

(corresponding with Section 611.311(a))

(benzene, carbon tetrachloride, p-dichlorobenzene, 1,2-dichloroethane, 1,1-dichloroethylene, 1,1,1-trichloroethane, trichloroethylene, and vinyl chloride)

January 9, 1989

Total Coliforms Rule (40 CFR 141.21 and 141.63)

(corresponding with Sections 611.521-611.527 and 611.325)

(total coliforms, fecal coliforms, and E. coli)

Replaced by the Revised Total Coliforms Rule (40 CFR 141, subpart Y)

December 31, 1990

Surface Water Treatment Rule (40 CFR 141, subpart H)

(corresponding with Subpart B)

(filtration, disinfection, and turbidity)

Effective:  December 31, 1990

Compliance: December 31, 1991

Lead and Copper (40 CFR141, subpart I)

(corresponding with Subpart G)

(lead and copper monitoring, reporting, and recordkeeping requirements of 40 CFR 141.86 through 141.91)

July 7, 1991

Phase II IOCs (40 CFR 141.62(b)(2) and (b)(4) through (b)(10))

(corresponding with Section 611.301(b))

(asbestos, cadmium, chromium, mercury, nitrate, nitrite, and selenium)

July 30, 1992

Phase II VOCs (40 CFR 141.61(a)(9) through (a)(18))

(corresponding with Section 611.311(a))

(o-dichlorobenzene, cis-1,2-dichloroethylene, trans-1,2-dichloroethylene, 1,2-dichloropropane, ethylbenzene, monochlorobenzene, styrene, tetrachloroethylene, toluene, and xylenes (total))

July 30, 1992

Phase II SOCs (40 CFR 141.61(c)(1) through (c)(18))

(corresponding with Section 611.311(c))

(alachlor, atrazine, carbofuran, chlordane, dibromochloropropane, ethylene dibromide, heptachlor, heptachlor epoxide, lindane, methoxychlor, polychlorinated biphenyls, toxaphene, 2,4-D, and 2,4,5-TP (silvex))

July 30, 1992

Phase V SOC (40 CFR 141.61(c)(3))

(corresponding with Section 611.311(c))

(endrin)

August 17, 1992

Lead and Copper (40 CFR141, subpart I)

(corresponding with Subpart G of this Part)

(lead and copper corrosion control, water treatment, public education, and lead service line replacement requirements of 40 CFR 141.81 through 141.85)

December 7, 1992

Phase IIB IOC (40 CFR 141.62(b)(3))

(corresponding with Section 611.301(b))

(barium)

January 1, 1993

Phase IIB SOCs (40 CFR 141.61(a)(9) through (a)(18))

(corresponding with Section 611.311(c))

(aldicarb, aldicarb sulfone, aldicarb sulfoxide, and pentachlorophenol.  See the Board note appended to Section 611.311(c) for information relating to implementation of requirements relating to aldicarb, aldicarb sulfone, and aldicarb sulfoxide.)

January 1, 1993

Phase V IOCs (40 CFR 141.62(b)(11) through (b)(15))

(corresponding with Section 611.301(b))

(antimony, beryllium, cyanide, nickel, and thallium)

January 17, 1994

Phase V VOCs (40 CFR 141.61(b)(19) through (b)(21))

(corresponding with Section 611.311(a))

(dichloromethane, 1,2,4-trichlorobenzene, and 1,1,2-trichloroethane)

January 17, 1994

Phase V SOCs (40 CFR 141.61(c)(19) through (c)(25))

(corresponding with Section 611.311(c))

(benzo(a)pyrene, dalapon, di(2-ethylhexyl)adipate, di(2-ethylhexyl)phthalate dinoseb, diquat, endothall, glyphosate, hexachlorobenzene, hexachlorocyclopentadiene, oxamyl, picloram, simazine, and 2,3,7,8-TCDD)

January 17, 1994

Consumer Confidence Report Rule (40 CFR 141, subpart Q)

(corresponding with Subpart O)

(notification to public of drinking water quality)

September 18, 1998

Interim Enhanced Surface Water Treatment Rule (40 CFR 141, subpart P)

(corresponding with Subpart R)

(applicable to suppliers providing water to fewer than 10,000 persons)

(Giardia lamblia, viruses, heterotrophic plate count bacteria, Legionella, Cryptosporidium, and turbidity)

February 16, 1999

Public Notification Rule (40 CFR 141, subpart Q)

(corresponding with Subpart V)

(notification to public of NPDWR violations, variances or exemptions, or other situations that could bear on public health)

June 5, 2000

Filter Backwash Rule (40 CFR 141.76)

(corresponding with Section 611.276)

(reuse of spent filter backwash water, thickener supernatant, or liquids from dewatering processes)

August 7, 2001

Disinfection/Disinfectant Byproducts Rule (40 CFR 141.64, 141.65 and 141, subpart L)

Smaller Systems (serving 10,000 or fewer persons)

December 16, 2001

Larger Systems (serving more than 10,000 persons)

(corresponding with Sections 611.312 and 611.313)

(total trihalomethanes, haloacetic acids (five), bromate, chlorite, chlorine, chloramines, and chlorine dioxide)

December 16, 2003

Long Term 1 Enhanced Surface Water Treatment Rule (40 CFR 141, subpart T)

(corresponding with subpart X)

(applicable to suppliers providing water to 10,000 or more persons)

(Giardia lamblia, viruses, heterotrophic plate count bacteria, Legionella, Cryptosporidium, and turbidity)

February 13, 2002

Radionuclides (40 CFR 141.66)

(corresponding with Section 611.330)

(combined radium (Ra-226 + Ra-228), gross alpha particle activity, beta particle and photon activity, and uranium)

December 8, 2003

Arsenic (40 CFR 141.62(b)(16))

(corresponding with Section 611.301(b))

(arsenic)

January 23, 2006

Stage 2 Disinfection/Disinfectant Byproducts Rule (40 CFR 141, subparts U and V)

Systems that serve fewer than 10,000 persons)

Submit plan

April 1, 2008

Complete monitoring or study

March 31, 2010

Submit IDSE report

July 1, 2010

Compliance with monitoring requirements

If no Cryptosporidium monitoring is required

October 1, 2013

If Cryptosporidium monitoring is required

October 1, 2014

Systems that serve 10,000 to 49,999 persons)

Submit plan

October 1, 2007

Complete monitoring or study

September 30, 2009

Submit IDSE report

January 1, 2010

Compliance with monitoring requirements

October 1, 2013

Systems that serve 50,000 to 99,999 persons)

Submit plan

April 1, 2007

Complete monitoring or study

March 31, 2009

Submit IDSE report

July 1, 2009

Compliance with monitoring requirements

October 1, 2012

Systems that serve 100,000 or more persons)

Submit plan

October 1, 2006

Complete monitoring or study

September 30, 2008

Submit IDSE report

January 1, 2009

Compliance with monitoring requirements

April 1, 2012

(corresponding with Subparts W and Y)

(total trihalomethanes and haloacetic acids (five))

Long Term 2 Enhanced Surface Water Treatment Rule (40 CFR 141, subpart W)

Systems that serve fewer than 10,000 persons

And that monitor for E. coli

Begin first round of monitoring

October 1, 2008

Begin treatment for Cryptosporidium

October 1, 2014

Begin second round of monitoring

October 1, 2017

And that monitor for cryptosporidium

Begin first round of monitoring

April 1, 2010

Begin treatment for Cryptosporidium

October 1, 2014

Begin second round of monitoring

April 1, 2019

Systems that serve 10,000 to 49,999 persons

Begin first round of monitoring

April 1, 2008

Begin treatment for Cryptosporidium

October 1, 2013

Begin second round of monitoring

October 1, 2016

Systems that serve 50,000 to 99,999 persons

Begin first round of monitoring

April 1, 2007

Begin treatment for Cryptosporidium

October 1, 2012

Begin second round of monitoring

October 1, 2015

Systems that serve 100,000 or more persons

Begin first round of monitoring

October 1, 2006

Begin treatment for Cryptosporidium

April 1, 2012

Begin second round of monitoring

April 1, 2015

(corresponding with Subpart Z)

(E. coli, Cryptosporidium, Giardia lamblia, viruses, and turbidity)

Groundwater Rule (40 CFR 141, subpart S)

December 1, 2009

(corresponding with Subpart S)

(E. coli, enterococci, and coliphage)

Revised Total Coliforms Rule (40 CFR 141, Subpart Y)

Effective: April 15, 2013

(corresponding with subpart AA)

Compliance: April 1, 2016

(total coliforms (indicator), E. coli)

Lead-Free Fixtures Rule (40 CFR 143, subpart B)

Effective: October 1, 2020

(corresponding with Section 611.126)

(lead in plumbing fixtures)

Compliance: September 1, 2023

Lead and Copper Rule Revisions (40 CFR 141, subpart I)

Effective: December 16, 2021

(corresponding with Subpart G)

(lead and copper (indicator))

Compliance: October 16, 2024