Is Dongola, IL Tap Water Safe to Drink?
Graded A-, with 4 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
87.4/100
waterverge.com Dongola, IL — Water Quality Report
Dongola's drinking water received a grade of A- (87.4 out of 100), indicating good water quality. The city's 1 water system serves approximately 752 residents using purchased ground water.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 16 violations on record, including 0 health-based violations. 4 remain unresolved.
What to know about Dongola's water
Dongola ranks #273 out of 891 cities in Illinois for water quality, placing it mid-range in the state.
Dongola purchases its water from a regional wholesaler, meaning quality depends on both the supplier's treatment and the local distribution system's condition.
As a small community water system, Dongola may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Dongola, IL water safe to drink?
Dongola's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (87.4/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 752 residents using groundwater (wells).
Recent water quality updates for Dongola
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Dongola's water quality assessment. Grade: A- (87.4/100).
Contaminants: Consumer Confidence Rule.
Contaminants: Revised Total Coliform Rule.
Contaminants: Chlorine.
Federal disaster declaration (FEMA DR-4461). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3230). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Dongola's water supply.
Well within EPA limits.
Violation history
Dongola's water system has 16 total violations on record, including 0 health-based violations. 4 remain unresolved. 3 violations were issued in the last 5 years.
Flood & environmental risk
Union County has experienced 6 federally declared disasters since 1969. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Dongola's water come from?
Dongola's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 752 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Dongola residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Dongola's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Dongola's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Drought conditions
D1 — moderate droughtUnion County is currently in D1 (moderate drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Union County has experienced 6 federally declared disasters since 1969. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Dongola compares by contaminant
Explore where Dongola ranks among all Illinois cities for specific contaminants.
Water source & infrastructure
Where Dongola's water comes from
Dongola purchases its water supply from a regional wholesale provider rather than treating raw water directly.
Water quality depends on both the wholesaler's treatment standards and the condition of Dongola's local distribution pipes and storage facilities.
Purchased water systems are common in suburban areas and smaller communities that lack the infrastructure for independent treatment.
The system is operated by local government ownership and serves approximately 752 people through 1 water system.
Water systems serving Dongola
| System Name | PWSID | Population | Source |
|---|---|---|---|
| DONGOLA | IL1810200 | 752 | GWP |
How Dongola compares
Full Illinois rankings →Dongola's score of 87.4/100 is above the average of 56/100 among major Illinois cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Illinois rankings →About Dongola, IL
Learn more about your water
Guides and resources related to Dongola's water quality findings.
Explore water quality across Union
Frequently asked questions
Is Dongola, IL tap water safe to drink?
Dongola's water quality earned a grade of A- (87.4/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #273 out of 891 cities tested in Illinois.
What contaminants are in Dongola's water?
Lead was measured at 0.0 ppb (90th percentile). 16 violations are on record.
How is Dongola's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Dongola?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Dongola's water come from?
Dongola's water is sourced from Purchased ground water. The city has 1 water system serving approximately 752 residents.
Is Dongola's groundwater at risk of contamination?
Dongola uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 16 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Dongola's water compare to other cities?
Dongola ranks #273 out of 891 cities in Illinois (better than 69% of state cities) and #4097 out of 15744 cities nationally (74th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Dongola's small water system affect quality?
Dongola's system serves approximately 752 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 16 violations on record.