Tap WaterIndex

Tap water quality report

Joliet

EPA monitoring tested this supplier for 110 contaminants and detected 19. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

110
contaminants tested
19
detected
160,000
people served
282
health-based violations
Water source
Ground water
Ownership
Local government
Counties served
Will

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

282
health-based violations
345
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2024-10-17
MCL Health-based Resolved 2007-10-01 → 2007-12-31
MCL Health-based Resolved 2007-10-01 → 2007-12-31
MCL Health-based Resolved 2007-10-01 → 2007-12-31
MCL Health-based Resolved 2007-10-01 → 2007-12-31
MCL Health-based Resolved 2007-10-01 → 2007-12-31
MCL Health-based Resolved 2007-10-01 → 2007-12-31
MCL Health-based Resolved 2007-07-01 → 2007-09-30
MCL Health-based Resolved 2007-07-01 → 2007-09-30
MCL Health-based Resolved 2007-07-01 → 2007-09-30

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Combined Radium (-226 And -228)
6.9 pCi/L 138%
of the EPA limit, in the worst sample — 5 pCi/L
 116/117 SYR4 2012–2019
Copper
1060 µg/L 82%
of the EPA limit 1300 µg/L
 91/125 SYR4 2012–2018
Barium
58.8 µg/L 2.9%
of the EPA limit 2000 µg/L
 34/34 SYR4 2012–2019
Fluoride
2290 µg/L 57%
of the EPA limit 4000 µg/L
 33/33 SYR4 2012–2019
Lead
0.0065 mg/L 43%
of the EPA limit 0.0150 mg/L
 26/26 LCR 2026
Lithium
54.7 µg/L
No EPA limit set
 22/22 UCMR-5 2025
Lead
29.3 µg/L 195%
of the EPA limit, in the worst sample — 15 µg/L
 18/124 SYR4 2012–2018
Nitrate
60 µg/L 0.6%
of the EPA limit 10000 µg/L
 6/196 SYR4 2012–2019
Xylenes, Total
1.81 µg/L 0%
of the EPA limit 10000 µg/L
 4/54 SYR4 2012–2019
Combined Uranium
0.5215 µg/L 1.7%
of the EPA limit 30 µg/L
 3/3 SYR4 2019
Gross Alpha, Excl. Radon And U
21.29 pCi/L 142%
of the EPA limit, in the worst sample — 15 pCi/L
 3/3 SYR4 2019
Nitrate-Nitrite
60 µg/L 0.6%
of the EPA limit 10000 µg/L
 3/98 SYR4 2012–2019
Dibromoacetic Acid
1.5 µg/L
No EPA limit set
 2/78 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
1.5 µg/L 2.5%
of the EPA limit 60 µg/L
 2/78 SYR4 2012–2019
Arsenic
0.5990 µg/L 6%
of the EPA limit 10 µg/L
 1/34 SYR4 2012–2019
Bromoform
1 µg/L
No EPA limit set
 1/78 SYR4 2012–2019
Dichloromethane
3.67 µg/L 73%
of the EPA limit 5 µg/L
 1/54 SYR4 2012–2019
Selenium
2.52 µg/L 5%
of the EPA limit 50 µg/L
 1/32 SYR4 2012–2019
TTHM
1 µg/L 1.3%
of the EPA limit 80 µg/L
 1/78 SYR4 2012–2019
91 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalBromodichloromethaneChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromochloromethaneDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Frequently asked questions about Joliet

Is Joliet tap water safe to drink?

EPA monitoring detected 19 contaminants in Joliet's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Joliet's water?

EPA monitoring detected Combined Radium (-226 And -228), Copper, Barium, Fluoride, Lead, and others. The full list with the level and data source for each is above.

How many people does Joliet serve?

Joliet reports serving 160,000 people, per its EPA record.

Has Joliet had any water quality violations?

The EPA has 345 violations on file for Joliet, of which 282 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.