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7C Page 18 .:.:.", .:" '~':.", ::.' \;.>k~\.~~~:~~~t~r~:.' Increased risk of cancer ...:.... " H::~4n,.~c.~m~*~hs:-~i~9~~ater .. Leaching from PVC pipes; discha e from lastic factories Human and animal fecal waste . . . PUblic :'. He;Jl~f.c;oal zero Contamin.ant :: Vinyl chloride Viruses (enteric) TT3 Xylenes (total) 10 Gastrointestinal illness (e.g" diarrhea, vomitin , cram s Nervous system damage zero Discharge from petroleum factories; discharge from chemical factories 10 NOTES 1 Dertnilioos . lAaximum Contaminatlt lGVel Goal (MCLG)- The level of a oontaminani in drinking wafer below which lhGre is no known or expected risk to health. MClGs allow for a I11<Irgin of safety and are no.Hnlorooable public heallh goals. . Maximum Contaminant Level (MQ)-Tha highest leVtll ci a contaminant lhat fs allowed in drinking water. !.lels are set as closa to MClGs as feasible using the best available Ireatmentlflclmology and taking cost ilto consideratioo. Mels are enlcrcaable stmdards. . Maximum Residual Dislnfac:arIt level Goal (MRDLG)-The l'lVel or a drinking water disinfectantbelo.v which there Is no known or expected risk to health. MRDLGs do not celiac: the benelilsof too use of disintactarllllle oonlrol mk:rotJial CO:l!aminanls. . Maxil1l.lm Res/dual Disinfectant level (MRDl)-The hIghest level of a disinfact2l1t allowed in dr'.nklng waler. There Is COllVin<:ing evidence IMI addition of a disinfeclanl is necessary for control of microbial oontaminants. . Trealn1enl T ecI1nique (TT}-A required process Inlendlld 10 reduce the level of a contaminant in drinking water. Units aroln milligrams per Iller (mgA.) unless otherwise noled. MilignVTls per liter are eqLivalent to parts per million (ppm). EPA's surface waler lrealmen! rules require sys!ems using &Jrf3C$ wals or ground water under the directinfluenceci surfaoo water (0 (l)disinfect their water, and (2) fihe; their wafer or meet criteria for avoid~ filtration 00 that the folloMng contam~'ar,ts are cootroiled at the felewing levels: . C/)1:itospotIdium{as of 111m for syilems serving >10,000 and 1/14J05 for systams serving <10,000) 99% removal. . Glmiilllembli8; 99.9% removaMnaclivolion . VIruses: 99.99% remova1linac~vation . LegioMna: No ~mit, but EPA bellavas that II GilnJla and vi'lJseS are removedlinaclivalod.l..iIglonel18 w~1 also be oonlIoJled. . T urbIdily: At no !iIM CM lurbidity (cloudiness of water) go above 5 nephelolomelri<: turbidity unils (NlU); systems that r~ler must ansurelhat thelurhidity go no higher than 1 NTU (0.5 NTU for oonven~Of1<lI or dirocl filtration) In at teast 95% of the daily samples In any month. As of Janu3I')' 1,2002, for systems servicing >10,000. and Jamary 14,2005, lor systtll11$ servicing <10.000. turbidity may oover exceed 1 NTU. 8I1d must not exceed 0.3 NTU in 95% of daily samples in any month. . HPC: No mora than 500 bacterial cdonies per milliller . lCllg Term 1 Enhanced Surface Water Treatment (Effective Dale: January 14, 20(5); Surface W@t systems or (GWUDI) syslGms serving ,_ than 10,000 people must oomrAY with the applicableloog Term 1 Enhanced Surface Water Troatroonl Rule provisions (e.g.lurbidily standards, Individual filter monUoring, Crwlo.sporidlumremoval requirements, updated walershed control requirnmenis 10( unfiltered systems). . FIller Backwash Recycling: The Filer Bacllwash RecycllnQ Rule requires systems that recycle to return specific recycle ftows tlYough an processes of the syslem's exisling convanlionaf or dirocl fillration system 01 al an alternate location approved by tha state. No more than 5.0% s<mpfes total ooIilam-pooiliva in a month. (For wafer systems thal co/lact fewer rhan 40 routine samples per moolh. no more than one sample can be total cdiform..posilive per month.) Every sallllie lJ1al has tolal colibrm I1l.Isl be analyzed for either fecal ooIiforms or E. coil If two coosecutive TCilos~iva samples, and one Is also posl~ve for E, coIifec"ii eotlforrns. system has an acute MCL violation. Fecal coliform and E. coO are bacleria"olll106a presence ioolCllles thai the water may be contaminated with hlnlan or animal wastes. Disease~using microbes (pathogens) In these wastes can cause diarrhea, cramps, nausea, headaches, or elher syrr.ploms. These pathog8llll may pose a special health risk klr Infants, young children, and people with seV81ely compromised immune systems. Although there is no collective MCLG for Ws contaminant group, thers are individual MClGs for soms or the Individual contaminarlts: . Haloacetic acids: dichloroacelic acid (zero); trichloroacetic acid (0.3 mgll) . Trihafomethanes: bromodId1fcromethane (ZIlla); bromoform (zero); dibromoehlorormlhllt'le (0.06 mgIl) Lead and copper are regulated by a Trealm6l'l Technique mat requires syslllms to control the oorrOGivOOOOll of thei water .If fOOIe than 10"1. of lap WalOf samples ex<:ood Ihe adJan IElYOI. water systems musllaka addrtional steps. For copper, the action level is 1.3 mg/L. a1d for lead is 0.015 mgll. Each water system must certily, in wrrtlng,lo the slale (using third-party or lOarlufaclulElfS certifioatlon) thafl'ohen if Uli8S acrylamide and/or epichlorooydrin to Ireal water, the combination (or product) of dose and mOllomer level does nol exceed the lovels speclfied, as fdlows: Acrylamlde " 0.05% dosed al1 mgll (or eQuivalent); Eplchlorohydrln = 0.01 % dosed al20 mgIl (or lIQuivalent). LEGEND r~ Dinslnfeclant II1II Inorganic Chemical l1li Organic Chemical Disinfection Byproduct - Microorganism l1li 5 Radionuclides