Colp

Community water system in Williamson County, Illinois, drawing primarily on purchased surface water.

Dataset updated July 2026 . Source: EPA SDWIS/ECHO public records.

Population served

506

Service connections

272

Primary source

SWP

Purchased surface water

System type

CWS

Community water system

System record

PWSIDIL1990200

System typeCommunity water system

Activity statusActive

Population served506

Service connections272

Primary water sourcePurchased surface water

Owner typeLocal government

Primacy agencyIL state drinking water program

City servedColp

StateIllinois

ZIP—

CountyWilliamson County →

Violations & enforcement

Began	Violation	Contaminant	Health-based	Status
2025-07-02	4H	5200	No	Unaddressed
2024-10-17	2E	5200	Yes	Unaddressed
2024-07-11	75	7500	No	Resolved
2024-07-01	71	7000	No	Resolved
2023-07-01	72	7000	No	Resolved
2023-04-01	27	2456	No	Resolved
2019-07-01	72	7000	No	Resolved
2014-11-01	23	3100	No	Resolved
2014-10-01	27	1006	No	Resolved
2013-10-01	52	5000	No	Resolved
2011-07-01	72	7000	No	Resolved
2004-12-14	65	5000	Yes	Resolved

Colp: frequently asked questions

Is Colp's water safe to drink?

Colp is an active community water system regulated under the Safe Drinking Water Act, overseen by the IL state drinking water program. EPA SDWA violation and enforcement records for this system are being added to AquaCensus from EPA ECHO; consult EPA ECHO or your annual Consumer Confidence Report for its current compliance status.

Who runs Colp?

Colp (PWSID IL1990200) is a local government-owned community water system, regulated by the IL state drinking water program.

How many people does Colp serve?

Colp reports serving 506 people through 272 service connections in Williamson County, Illinois.

Where does Colp get its water?

EPA SDWIS lists this system's primary water source as purchased surface water.

Other water systems in Williamson County

Water system	County	Population served	Type	Source
City of Georgetown	Williamson	191,639	Community	Surface water
City of Round Rock	Williamson	130,662	Community	Surface water
City of Leander	Williamson	98,330	Community	Surface water
City of Cedar Park	Williamson	86,939	Community	Surface water
Franklin Water Dept	Williamson	77,222	Community	Surface water
H.B.& T.S. Utility District	Williamson	40,094	Community	Purchased surface water