56,158 water systems were never in the federal PFAS survey. Their first results are due by April 2027.

The federal PFAS rule covers 66,415 active community and non-transient non-community water systems. EPA's UCMR 5 survey sampled 10,257 of them. The rest are mostly small systems, and every one has to complete initial monitoring through a certified lab by April 26, 2027. This is that list, by state, with the contact EPA has on file.

56,158

Active systems not sampled under UCMR 5

6,588

Of those, schools and daycares

84%

With a phone number

69%

With an email

All states — 56,158 systems

Every state and territory in one file. For lab networks and mail-in labs that take samples from anywhere.

$499

By state — $149 each

States marked “own rule first” set PFAS drinking-water limits before the federal rule and made systems sample under them. Small systems there have most likely tested already, so those lists are weaker. They are still sold, but go in knowing that.

State	Systems	Community	Schools / daycares	With phone	With email
Texas	4,534	3,619	148	4,368	2,941
California	3,682	2,237	397	3,639	3,661
New YorkOWN RULE FIRST	2,613	1,935	305	2,261	1,782
PennsylvaniaOWN RULE FIRST	2,519	1,491	494	2,483	0
Washington	2,516	2,131	101	76	82
MichiganOWN RULE FIRST	2,480	1,081	626	2,234	1,892
North Carolina	2,000	1,699	169	1,809	1,976
Florida	1,966	1,204	191	1,957	5
WisconsinOWN RULE FIRST	1,728	855	346	26	30
Illinois	1,715	1,308	162	1,591	1,357
Georgia	1,648	1,490	52	1,572	1,565
Missouri	1,430	1,205	90	1,318	993
Virginia	1,383	892	272	1,041	1,130
Ohio	1,348	793	192	1,228	1,284
Minnesota	1,269	800	134	793	804
Oregon	1,167	823	160	1,158	1,132
Indiana	1,140	547	226	1,133	1,107
Montana	1,121	809	125	1,087	569
New HampshireOWN RULE FIRST	1,108	657	270	0	0
Colorado	1,074	903	57	1,052	1,068
Iowa	1,044	930	22	1,020	1,011
Arizona	1,004	791	100	942	926
Idaho	958	713	71	935	933
Maryland	936	388	288	812	841
New JerseyOWN RULE FIRST	910	310	258	817	98
Connecticut	888	414	210	875	885
Mississippi	850	780	11	791	761
Oklahoma	814	731	33	783	763
Kansas	788	755	16	778	768
Louisiana	767	645	31	718	765
MaineOWN RULE FIRST	730	347	296	637	591
Nebraska	676	544	36	662	630
New Mexico	669	524	61	664	654
VermontOWN RULE FIRST	620	370	163	612	605
Alaska	608	380	85	570	598
Arkansas	512	487	2	478	378
MassachusettsOWN RULE FIRST	508	267	132	507	507
South Carolina	479	399	36	475	478
South Dakota	470	455	14	344	468
Utah	469	383	12	458	469
Wyoming	383	295	17	378	381
West Virginia	370	315	25	294	169
Puerto Rico	353	306	5	309	1
Nevada	320	177	14	303	317
North Dakota	284	279	1	244	271
Delaware	250	171	39	182	174
Alabama	215	194	0	196	214
Tennessee	196	171	6	171	195
U.S. Virgin Islands	168	75	34	19	7
Kentucky	158	143	3	158	158
Rhode IslandOWN RULE FIRST	141	63	39	140	141
Hawaii	87	74	0	78	58
Northern Mariana Islands	47	35	1	44	44
District of Columbia	13	8	10	13	13

Not sold separately because they have fewer than 10 systems (all are in the national file): AS, GU.

What is in the file

The system

Name, PWSID, counties served, community or non-transient non-community, whether it is a school or daycare, population, connections, and owner type.

The sampling job

Groundwater or surface water, whether it buys its water, and the number of initial samples the rule asks for at each entry point: two for groundwater systems serving 10,000 or fewer, four for everyone else.

How good a prospect

A flag on every system in a state that had its own PFAS drinking-water limits before the federal rule. Those systems have probably tested already.

Who to call

The organization and administrative contact on file with EPA: name, phone, email where reported, mailing city and ZIP, and the date the record was last updated.

Three rows from the Alabama file, sorted largest-first as delivered. Contact fields masked here.
System	County	Population	Source	Initial samples	Contact	Phone	Email
NEW BROCKTON WATER DEPARTMENT	Coffee	4,185	Groundwater	2	••••••, •••••	•••-•••-••••	•••••@•••••.•••
FLORALA WATER WORKS & SEWER BOARD	Covington	3,834	Groundwater	2	••••••, •••••	•••-•••-••••	•••••@•••••.•••
ROCKFORD UTILITIES BOARD, INC	Coosa	3,759	Purchased surface water	—	••••••, •••••	•••-•••-••••	•••••@•••••.•••

Read this before you buy.

“Not in UCMR 5” is not the same as “never tested.” Some of these systems have sampled under a state rule or a state-run program, and the federal rule lets earlier results count toward initial monitoring if they meet its requirements. We know which systems the federal survey skipped. We do not know which of them already hold usable results or already have a lab.
Ten states had their own rules first. Massachusetts, Maine, Michigan, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, Wisconsin. Rows in those states are flagged in the file and marked in the table above.
Systems that buy their water may not sample at all. Whether a purchasing system tests itself or relies on its wholesaler's results is up to the state. Those rows are flagged and the sample count is left blank.
You could build this yourself. It comes from two public EPA files: the SDWA system inventory (Q2 2026) and the UCMR 5 results. You are paying for the filtering, the join, and the hours.
Some of EPA's numbers are wrong. Population figures for a handful of small non-community systems are plainly overstated in the federal inventory. We pass them through as reported.
Contacts are what EPA has on file. Often an owner, clerk, or operator; sometimes a management company. Expect some to be out of date. Using the emails is your responsibility under CAN-SPAM.
9 rows have no contact. Lawyers representing those systems have asked us not to contact their clients, so we do not pass the contact on either.
The date could move. April 26, 2027 is the deadline in the rule as it stands. EPA's pending proposals would extend the treatment deadline, not this one, but neither is final and the rule is also before the D.C. Circuit.

If the file is not what this page describes, email info@pfascomply.com and we will put it right. Looking for systems that have already tested above the limit? That is the other list.

Sources: EPA SDWA public water system inventory (Q2 2026, active community and non-transient non-community systems) and EPA UCMR 5 occurrence data. PFAS Comply is a data platform — we don't test water, endorse labs, or give legal advice.