01The verdict: is Decatur City water safe?
Decatur City's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (90.2/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 1,373 residents using surface water (rivers, lakes, or reservoirs).
2 unresolved violations on record
EPA records show open compliance items for this system. Most are administrative, but unresolved items are worth watching.
See what was cited ↓Lead is well under the limit
90th-percentile lead is 0.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓A flood-prone service area
7 federal disaster declarations on record. After severe weather, watch for boil-water advisories.
See the risk factors ↓Decatur City's drinking water received a grade of A (90.2 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 1,373 residents using purchased surface 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 5 violations on record, including 3 health-based violations. 2 remain unresolved.
Decatur City ranks #188 out of 430 cities in Iowa for water quality, placing it mid-range in the state. The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection. As a small community water system, Decatur City may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Decatur City's water
Every contaminant flagged in Decatur City, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
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 |
Cities ranked by 90th-percentile lead PF PFAS in Iowa
Cities ranked by compounds detected Cu Copper in Iowa
Cities ranked by 90th-percentile copper
03Decatur City's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 5 violations on record, including 3 health-based violations. 2 remain unresolved.
All ten of the last ten years were clean — no EPA violations recorded for Decatur City.
▼ Down 0 ppb since 1993. Latest reading: 0 ppb (2024) — 0% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Decatur City's water comes from
Decatur City's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Purchased Surface Water
Rivers, lakes, or reservoirs — more exposed to runoff, agriculture, and seasonal swings than groundwater.
Wholesale supplier
Multi-barrier treatment: coagulation, sedimentation, filtration, and disinfection to meet EPA standards.
1 system
1 water system, operated under private ownership.
1,373 people
Residents served across Decatur City's service area.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards. These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge. The system is operated by private ownership and serves approximately 1,373 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| SIRWA #3 (LEON) | IA2718755 | 1,373 | Purchased Surface Water |
05Pressure on Decatur City's watershed
Outside forces that shape what reaches the treatment plant. None of these is a verdict on the tap by itself — but each adds pressure worth knowing about.
Flood & storm history
7 federal disaster declarations on record for Union County. Flooding and severe storms can overwhelm treatment plants, cause sewage overflows, and push runoff into supplies.
06How Decatur City compares
Scores for nearby Iowa cities on one line, with the average marked.
dashed line = Iowa average (72/100)
Decatur City scores 90.2/100 — above the Iowa average of 72/100. It outscores 10 of 10 nearby cities. Full Iowa rankings →
85 / 100CDavenport, IA
55 / 100DCedar Rapids, IA
45.5 / 100FIowa City, IA
42 / 100BAmes, IA
81.5 / 100BSioux City, IA
77.3 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
07What to do at home
Steps matched to what testing actually found in Decatur City's water — not generic advice.
A basic carbon filter still helps
Decatur City's water meets federal standards, but a simple carbon filter improves taste and adds a margin of safety against short-term issues.
Compare tested filters →Read your utility's annual report
Every utility must publish a yearly Consumer Confidence Report with its own testing results. It pairs well with the independent data on this page.
How to read a CCR →Watch for Decatur City alerts
This area has a history of flood declarations — after severe weather, watch for boil-water advisories from the utility, and check the live alerts on this page.
All water alerts →Frequently asked questions
Is Decatur City, IA tap water safe to drink?
Decatur City's water quality earned a grade of A (90.2/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #188 out of 430 cities tested in Iowa.
What contaminants are in Decatur City's water?
Lead was measured at 0.0 ppb (90th percentile). 5 violations are on record.
How is Decatur City'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 Decatur City?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Decatur City's water come from?
Decatur City's water is sourced from Purchased surface water. The city has 1 water system serving approximately 1,373 residents.
What health violations has Decatur City's water system had?
Decatur City has 3 health-based violations on record. The most recent violation was recorded in October 2014. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
How does Decatur City's water compare to other cities?
Decatur City ranks #188 out of 430 cities in Iowa (better than 56% of state cities) and #2360 out of 15382 cities nationally (85th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Decatur City's small water system affect quality?
Decatur City's system serves approximately 1,373 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 5 violations on record.