County · Illinois

LaSalle County, Illinois: drinking water records

Name: Drinking water records for LaSalle County, Illinois
Creator: U.S. Environmental Protection Agency
License: https://www.usa.gov/government-works

Explore EPA records for 37 community water systems across 26 ZIP codes in LaSalle County, then find water-testing resources and available recent monitoring-station readings.

In focus37Community water systems

Public records. Clearer context.

Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages

Drinking-water records

EPA survey and compliance records are historical reports. UCMR 5 results are available for 8 of the 37 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.

systems in EPA's PFAS survey

systems where PFAS was found

systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses

systems that have reached the lead action level

systems with a health-based violation since 2016

System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.

Water systems in this county

All 37 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.

Water system	People served	PFAS survey results	PFAS found	Health-based violations	Lead, 9 in 10 homes at or below
Ottawa IL0990800	18,097	120	0	1	5.0 ppbbelow the action level
Peru IL0990850	10,300	60	0	1	10.5 ppbbelow the action level
La Salle IL0990300	9,700	60	2	6	9.0 ppbbelow the action level
Mendota IL0990550	7,100	180	0	3	8.1 ppbbelow the action level
Marseilles IL0990500	5,061	120	0	1	19.1 ppbat or above the action level
Il American-Streator IL0995030	19,000	120	4	0	1 ppbbelow the action level
Prairie Path Water Company-Lake Holiday IL0995200	4,750	60	0	0	2 ppbbelow the action level
Oglesby IL0990700	4,500	60	0	0	0 ppbbelow the action level
North Utica IL0990650	1,323	0	0	1	5.3 ppbbelow the action level
Grand Ridge IL0990200	515	0	0	2	0 ppbbelow the action level
Lostant IL0990450	463	0	0	1	0.7 ppbbelow the action level
Fields Hill Improvement Association IL0995150	312	0	0	2	4.4 ppbbelow the action level
Country Acres MHP (La Salle County) IL0995365	222	0	0	16	7.3 ppbbelow the action level
Retz Addn Improvement Association IL0995400	168	0	0	1	1.2 ppbbelow the action level
Countryside Estates MHP IL0995185	158	0	0	1	0 ppbbelow the action level
La Salle County Nursing Home IL0995329	100	0	0	1	0 ppbbelow the action level
Jons MHP IL0990020	92	0	0	1	0 ppbbelow the action level
Land and Wtr Assn IL0995050	83	0	0	15	7 ppbbelow the action level
Seneca Mobile Homes LLC IL0995425	10	0	0	6	0 ppbbelow the action level
Seneca IL0991050	2,353	0	0	0	0 ppbbelow the action level
Sheridan Correctional Center IL0995840	1,670	0	0	0	0 ppbbelow the action level
Earlville IL0990150	1,613	0	0	0	2.9 ppbbelow the action level
Wildwood Estates IL0995265	1,001	0	0	0	0 ppbbelow the action level
Leland IL0990350	951	0	0	0	0 ppbbelow the action level
Tonica IL0991150	705	0	0	0	0 ppbbelow the action level
Naplate IL0990600	465	0	0	0	0 ppbbelow the action level
Cedar Point Water Company IL0995040	266	0	0	0	4.9 ppbbelow the action level
Rutland IL0991000	259	0	0	0	0 ppbbelow the action level
Four Star Campground IL0990060	250	0	0	0	0 ppbbelow the action level
Jonesville Pwd IL0995170	243	0	0	0	0.5 ppbbelow the action level
Ottawa Estates MHP (Formerly Dattis MHP) IL0995225	125	0	0	0	0 ppbbelow the action level
Il American-Leonore IL0990400	111	0	0	0	6 ppbbelow the action level
Mendota Estates MHP IL0990560	110	0	0	0	0 ppbbelow the action level
Lynnwood Water Corporation IL0995336	100	0	0	0	0 ppbbelow the action level
Ilog Oglesby MHP, LLC IL0995750	88	0	0	0	0 ppbbelow the action level
Il Prairie Estate Sbdv Water Association IL0995300	78	0	0	0	0.5 ppbbelow the action level
Oaklane Sbdv IL0995250	63	0	0	0	5 ppbbelow the action level

Shaded rows report lead at or above the 15 ppb action level in their latest monitoring period. EPA sets that level for the value 9 in 10 sampled homes fall at or below; reaching it requires the utility to act, and it is not a measurement of any single tap. One system in this table is at or above it. What an action level means

USGS · Monitoring stations

The water, more recently.

Available station readings in LaSalle County, Illinois. Each measurement keeps its time, unit and original source.

These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.

Recent observations load when this section comes into view.

How these readings update

We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.

Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.

Your next step

Water testing, reports & local help.

Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.

Official national directories

Water testing

Find your state’s private-well program

EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-05

Water testing

Find a certified drinking-water laboratory

Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-11

Public records

Find your utility’s Consumer Confidence Report

EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-09-09

Public records

Explore USGS water observations

Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.

U.S. Geological Survey
Source reviewed 2026-09-15

A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.

Understand water testing and laboratory reports

Resource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction

Explore your area

Local coverage in LaSalle County

26ZIP areas in this overview

Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.

Towns and communities

Cedar Point
Dana
Earlville
Grand Ridge
LaSalle
Leland
Leonore
Lostant
Marseilles
Mendota
Millington
North Utica
Oglesby
Ottawa
Peru
Ransom
Rutland
Seneca
Serena
Sheridan
Streator
Tonica
Triumph
Troy Grove
Wedron
Wenona

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

60470Ransom
60518Earlville
60531Leland
60537Millington
60549Serena
60551Sheridan
60557Wedron
61301LaSalle
61316Cedar Point
61321Dana
61325Grand Ridge
61332Leonore
61334Lostant
61341Marseilles
61342Mendota
61348Oglesby
61350Ottawa
61354Peru
61358Rutland
61360Seneca
61364Streator
61370Tonica
61371Triumph
61372Troy Grove
61373North Utica
61377Wenona

These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.

Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.

Beyond this county page

Keep reading. Compare nearby.

PFASChoosing a PFAS filterPFAS was found in 2 of the 8 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter17 systems here have reached the lead action level. See how to check a filter’s lead-reduction certification.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.

Counties near LaSalle County

All Illinois counties

Sources and scope

EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.

Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.

Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.