Ralls County PWSD 1 water quality report, rewritten
- Serves
- 7,662
- Connections
- 2,953
- Water source
- Groundwater
- Based in
- Hannibal, MO
- County
- Ralls
- Owner
- Local government
PWSID MO2024499 · EPA data
Read this first
- PFOA (above the health goal) was found in two of 2 samples, highest 6.3 ppt. Above the 4.0 ppt legal limit in at least one sample. Compliance is judged on a running annual average, not one sample.
- Lithium (above EPA’s health benchmark) was found in two of 2 samples, highest 14.2 ppb. Above EPA’s health reference level of 10 ppb, a screening level rather than an enforceable limit.
8 health-based violations since 2016. Details are below.
What handles itWhat was found
Highlighted: above the health goal, or EPA’s health benchmark where there is no goal. Circled: above the legal limit in at least one sample, or the action level. Every scale puts that line at its middle.
PFAS and lithium: EPA UCMR 5, samples taken from June 11, 2025 to Dec. 15, 2025. Each blue tick on a scale is one sample where it was found.
NSF’s PFAS claims are tested to below 20 ppt. EPA’s limit is 4.0 ppt, and EPA says no certification yet shows a filter reaching its levels.
PFOA (above the health goal)
Comes from the source
6.3 (above the legal limit in at least one sample)ppt
Highest of 2 samples; found in two
Above the 4.0 ppt legal limit in at least one sample. Compliance is judged on a running annual average, not one sample.
What handles it
- NSF/ANSI 53Look for: PFOA Reduction
- NSF/ANSI 58Look for: Perfluorooctanoic Acid (PFOA)
Lithium (above EPA’s health benchmark)
Comes from the source
14.2ppb
Highest of 2 samples; found in two
Above EPA’s health reference level of 10 ppb, a screening level rather than an enforceable limit.
What handles it
No certification claim covers this compound yet.
PFBS
Comes from the source
11.4ppt
Highest of 2 samples; found in two
Below EPA’s hazard index benchmark of 2,000 ppt. PFBS has no legal limit or health goal of its own.
What handles it
- NSF/ANSI 53Look for: Total PFAS Reduction
Also found, with no federal limit
EPA measured these PFAS to learn how often they occur. None has a legal limit or a health goal yet.
| Compound | Highest sample | Found in | Certification claim |
|---|---|---|---|
| PFBA | 79.9 ppt | 2 of 2 | None covers it |
| PFPeA | 3.5 ppt | 1 of 2 | None covers it |
Tested and not found
Below EPA’s minimum reporting level in every sample taken from June 11, 2025 to Dec. 15, 2025. Not found means not measured above that level, which is not the same as zero.
All 26 compounds tested and not found
- 11Cl-PF3OUdS
- 4:2 FTS
- 6:2 FTS
- 8:2 FTS
- 9Cl-PF3ONS
- ADONA
- HFPO-DA (GenX)
- Lead
- NEtFOSAA
- NFDHA
- NMeFOSAA
- PFDA
- PFDoA
- PFEESA
- PFHpA
- PFHpS
- PFHxA
- PFHxS
- PFMBA
- PFMPA
- PFNA
- PFOS
- PFPeS
- PFTA
- PFTrDA
- PFUnA
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| TTHM | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | Jan. 1, 2023 to March 31, 2023 | 81.1 UG/L | Resolved |
| TTHM | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | Oct. 1, 2022 to Dec. 31, 2022 | 85 UG/L | Resolved |
| TTHM | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | July 1, 2022 to Sept. 30, 2022 | 88 UG/L | Resolved |
| TTHM | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | April 1, 2022 to June 30, 2022 | 82 UG/L | Resolved |
| TTHM | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | Oct. 1, 2020 to Dec. 31, 2020 | 85.2 UG/L | Resolved |
| TTHM | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | July 1, 2020 to Sept. 30, 2020 | 82 UG/L | Resolved |
| TTHM | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | April 1, 2020 to June 30, 2020 | 96.5 UG/L | Resolved |
| TTHM | The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average | Jan. 1, 2017 to March 31, 2017 | 84 UG/L | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 1 monitoring or reporting violation not shown. | ||||
What handles it
A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”
- NSF/ANSI 53
Claim: PFOA Reduction
Other certifiers’ wording: Total PFAS Reduction; Perfluorooctanoic Acid (PFOA)
For: PFOA
- NSF/ANSI 58
Claim: Perfluorooctanoic Acid (PFOA)
For: PFOA
At the tap, or for the whole house?
These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. How whole-house systems compare.
Filters with those claims on a certifier’s listing
TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money
ZeroWater 10 Cup Pitcher (ZP-010)
Pitcher
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53checked Oct. 4, 2026
Certified for: PFOA
Aquasana Claryum Direct Connect (AQ-MF-1)
Under-sink carbon
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 401checked Oct. 4, 2026
Certified for: PFOA
Under-sink reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58checked Oct. 4, 2026
Certified for: PFOA
Countertop reverse osmosis
- IAPMO listing:NSF/ANSI 42NSF/ANSI 53NSF/ANSI 58NSF/ANSI 401checked Oct. 4, 2026
Certified for: PFOA
What this report cannot tell you
- Levels of everything else. Federal bulk data carries results for PFAS, lithium, lead and copper, and violations for the rest. Nitrate, arsenic, disinfection byproducts and other levels are in Ralls County PWSD 1’s own annual report, which it must send you every year.
- Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.
- Anything after the latest data. SDWIS data is from 2026 Q2; UCMR 5 samples are from June 11, 2025 to Dec. 15, 2025.
Other Missouri utilities
- MO American St Louis St Charles Counties1.1 million
- Kansas City PWS553,295
- St Louis City PWS304,709
- City Utilities of Springfield210,898
- City of Columbia Utilities126,254
- Independence PWS120,000
- St Charles County PWSD 2100,587
- Lees Summit PWS99,400
- MO American St Joseph89,171
- St Charles PWS78,961
- MO American Joplin73,728
- Blue Springs PWS61,084
Sources
- EPA UCMR 5 occurrence data, file of Aug. 27, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q2
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
What to do next
Read up on the 2 marked results
What each one does to health, where it comes from, and the certification claim that addresses it.
Start with PFOAGet the utility’s own report
Ralls County PWSD 1 must send you a water quality report every year. It lists nitrate, arsenic and byproduct levels this page cannot.
How to read itTest your own tap for lead
Your service line, solder and fixtures decide the lead at your faucet, not the utility’s average.
Lead in your water: what to doCompare certified filters
What the filters certified for these results cost over five years, cartridges included.
Compare five-year costs