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Document ID us-rtdaiwt-2025-11-18 Title Resources, Tools and Databases about Impaired Waters and TMDLs URL https://www.epa.gov/tmdl/resources-tools-and-databases-about-impaired-waters-and-tmdls Jurisdiction /us Subdomain(s) none Language Status completed Analyzed at 2026-05-12 04:38:19.707344+00:00 Relevance inventory_targeted_fetch

4 Qualitative 12 Quantitative 0 Definitions

Q Qualitative Requirements (4)

Req ID	Category	Intent	Legal Status	Name	Subdomain(s)	Context	Conditions	Confidence
#R001	monitoring	operational	mandatory	Initial and Ongoing PFAS Monitoring	drinking water	Public water systems must monitor for these PFAS and have three years to complete initial monitoring (by 2027), followed by ongoing compliance monitoring.	Initial monitoring to be completed by 2027	high
#R002	reporting	reporting	mandatory	Public Information Disclosure	drinking water	Water systems must also provide the public with information on the levels of these PFAS in their drinking water beginning in 2027.	Beginning in 2027	high
#R003	treatment	treatment	mandatory	PFAS Reduction Solution Implementation	drinking water	Public water systems have five years (by 2029) to implement solutions that reduce these PFAS if monitoring shows that drinking water levels exceed these MCLs.	If monitoring shows that drinking water levels exceed MCLs; completion by 2029	high
#R004	corrective_action	operational	mandatory	Violation Corrective Action and Public Notification	drinking water	Beginning in five years (2029), public water systems that have PFAS in drinking water which violates one or more of these MCLs must take action to reduce levels of these PFAS in their drinking water and must provide notification to the public of the violation.	Beginning in 2029; applies if drinking water violates one or more MCLs	high

P Quantitative Requirements (12)

Req ID	Category	Intent	Legal Status	Name	Subdomain(s)	Limit Type	Limit Value	Context	Conditions	Confidence
#R005	chemical	aesthetic	guideline	Fluoride (Secondary Standard)	drinking water	AO	2.0 mg/L	Public notice required for community water systems if exceeded	Community water systems that exceed 2 mg/L but not 4.0 mg/L	high
#R006	chemical	health	mandatory	Fluoride (Primary Standard)	drinking water	MAC	4.0 mg/L	National Primary Drinking Water Regulation reference		high
#R007	chemical	aesthetic	guideline	Foaming Agents	drinking water	AO	0.5 mg/L	National Secondary Drinking Water Regulations		high
#R008	chemical	aesthetic	guideline	Iron	drinking water	AO	0.3 mg/L	National Secondary Drinking Water Regulations		high
#R009	chemical	aesthetic	guideline	Manganese	drinking water	AO	0.05 mg/L	National Secondary Drinking Water Regulations		high
#R010	physical	aesthetic	guideline	Odor	drinking water	AO	3 threshold odor number	National Secondary Drinking Water Regulations		high
#R011	physical	aesthetic	guideline	pH	drinking water	AO	6.5-8.5 pH units	National Secondary Drinking Water Regulations		high
#R012	chemical	aesthetic	guideline	Silver	drinking water	AO	0.10 mg/L	National Secondary Drinking Water Regulations		high
#R013	chemical	aesthetic	guideline	Sulfate	drinking water	AO	250 mg/L	National Secondary Drinking Water Regulations		high
#R014	physical	aesthetic	guideline	Total Dissolved Solids	drinking water	AO	500 mg/L	National Secondary Drinking Water Regulations		high
#R015	chemical	aesthetic	guideline	Zinc	drinking water	AO	5 mg/L	National Secondary Drinking Water Regulations		high
#R016	operational	reporting	mandatory	Fluoride Secondary Standard Exceedance Public Notice Deadline	drinking water	requirement	<= 12 months	Community water systems that exceed the fluoride secondary standard of 2 mg/L, but do not exceed the primary standard of 4.0 mg/L	From the day the water system learns of the exceedance	high

D Definitions (0)

No definitions.