Is Rock Port, MO Tap Water Safe to Drink?
Graded A, with 1 unresolved violation on record. See what was cited — and what it means for your tap. What to do next ↓
93.1/100
waterverge.com Rock Port, MO — Water Quality Report
Rock Port's drinking water received a grade of A (93.1 out of 100), indicating excellent water quality. The city's 2 water systems serve approximately 1,343 residents using purchased ground water.
Lead levels were measured at 1.1 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 1 health-based violation. 1 remains unresolved.
What to know about Rock Port's water
Rock Port ranks #32 out of 509 cities in Missouri for water quality, placing it one of the best in the state.
Rock Port 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, Rock Port may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Rock Port, MO water safe to drink?
Rock Port's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (93.1/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 2 water systems serve approximately 1,343 residents using groundwater (wells).
Recent water quality updates for Rock Port
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Rock Port's water quality assessment. Grade: A (93.1/100).
Contaminants: Revised Total Coliform Rule.
Contaminants: Groundwater Rule.
Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Rock Port's water supply.
Well within EPA limits.
Violation history
Rock Port's water system has 5 total violations on record, including 1 health-based violation. 1 remain unresolved. 2 violations were issued in the last 5 years.
Where does Rock Port's water come from?
Rock Port's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 1,343 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Rock Port residents can do
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.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
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. | 1.1 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Rock Port compares by contaminant
Explore where Rock Port ranks among all Missouri cities for specific contaminants.
Water source & infrastructure
Where Rock Port's water comes from
Rock Port 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 Rock Port'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 1,343 people through 2 water systems.
Water systems serving Rock Port
| System Name | PWSID | Population | Source |
|---|---|---|---|
| ROCK PORT PWS | MO1010696 | 1,318 | GWP |
| ATCHISON COUNTY WHOLESALE WATER COMM | MO1021595 | 25 | GW |
How Rock Port compares
Full Missouri rankings →Rock Port's score of 93.1/100 is above the average of 62/100 among major Missouri cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Missouri rankings →About Rock Port, MO
Wikipedia →Rock Port is a city in and the county seat of Atchison County, Missouri, United States. The population was 1,278 at the 2020 census.
Learn more about your water
Guides and resources related to Rock Port's water quality findings.
Explore water quality across Atchison
Frequently asked questions
Is Rock Port, MO tap water safe to drink?
Rock Port's water quality earned a grade of A (93.1/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #32 out of 509 cities tested in Missouri.
What contaminants are in Rock Port's water?
Lead was measured at 1.1 ppb (90th percentile). 5 violations are on record.
How is Rock Port'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 Rock Port?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Rock Port's water come from?
Rock Port's water is sourced from Purchased ground water. The city has 2 water systems serving approximately 1,343 residents.
What health violations has Rock Port's water system had?
Rock Port has 1 health-based violation on record. The most recent violation was recorded in November 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 1 violation remains unresolved.
Is Rock Port's groundwater at risk of contamination?
Rock Port 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 5 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 Rock Port's water compare to other cities?
Rock Port ranks #32 out of 509 cities in Missouri (better than 94% of state cities) and #971 out of 15744 cities nationally (94th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.