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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
EPA records for MARION MUNICIPAL WATER DEPT • Updated October 2026
Grade A — based on EPA compliance records, lead testing and PFAS monitoring
MARION MUNICIPAL WATER DEPT has a clean recent record: no health-based violations in the last five years and no lead, PFAS or historical monitoring result that costs it more than a few points.
Yes — by EPA's records Marion, IA tap water is safe to drink and earns an A. The grade rests on lead at 8.3 ppb (90th percentile) — under the 15 ppb action level but above 5 ppb. Lead from your own service line or plumbing is the main risk city-level data cannot see, so homes built before 1986 should still test at the tap.
Yes — by EPA's records Marion, IA tap water is safe to drink and earns an A. The grade rests on lead at 8.3 ppb (90th percentile) — under the 15 ppb action level but above 5 ppb. Lead from your own service line or plumbing is the main risk city-level data cannot see, so homes built before 1986 should still test at the tap.
MARION MUNICIPAL WATER DEPT's most recent Lead and Copper Rule result (2022-01-01 to 2024-12-31) was 8.3 ppb at the 90th percentile, below EPA's 15 ppb action level. Because lead usually comes from service lines and household plumbing, homes built before 1986 should still test at the tap.
No. None of the 232 UCMR5 PFAS results for MARION MUNICIPAL WATER DEPT (2024-07-09 to 2025-01-14) were at or above the reporting limit of roughly 3–5 ppt.
No. EPA's SDWIS shows no violations of any kind for MARION MUNICIPAL WATER DEPT since 2016.
MARION MUNICIPAL WATER DEPT reports groundwater as its primary source and serves about 41,623 people (EPA PWSID IA5751035).
Optional but sensible. The findings on this page are below federal limits; an NSF-certified pitcher or under-sink filter handles lead and improves taste.
Compare filter options for your Marion tap water
Lead was found at 8.3 ppb (90th percentile) in Marion's latest tap sampling — below the action level, but there is no safe level of lead.
See the filters matched to Marion's EPA results → — which certification actually removes what was found here, and what it does not touch.
Unsure which contaminants to treat? Compare home kits and certified lab testing before buying.
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MARION MUNICIPAL WATER DEPT · SDWIS records since 2016 · 5-year window starts 2021-09-13
EPA records no health-based violations for this system in the last five years.
No violations of any kind on file since 2016.
Source: ECHO SDWA bulk download (SDWA_VIOLATIONS_ENFORCEMENT.csv, SDWIS 2026Q2, file dated 2026-07-09, fetched 2026-09-13)
EPA Lead and Copper Rule 90th-percentile results reported by MARION MUNICIPAL WATER DEPT
Below the action level, but detectable. In the most recent monitoring period on file (2022-01-01 to 2024-12-31), 90% of the homes MARION MUNICIPAL WATER DEPT sampled had lead at or below 8.3 ppb.
EPA's action level is 15 ppb (dropping to 10 ppb under the 2024 Lead and Copper Rule Improvements). There is no safe level of lead; the 90th-percentile figure describes the system, not your tap — homes with lead service lines or pre-1986 plumbing can be higher.
| Monitoring period | Lead 90th percentile | vs 15 ppb action level |
|---|---|---|
| 2022-01-01 → 2024-12-31 | 8.3 ppb | Below the action level, but detectable |
| 2019-01-01 → 2021-12-31 | 6.5 ppb | Below the action level, but detectable |
| 2016-01-01 → 2018-12-31 | 4.2 ppb | Well below the 15 ppb action level |
| 2013-01-01 → 2015-12-31 | 4.6 ppb | Well below the 15 ppb action level |
| 2010-01-01 → 2012-12-31 | 5.6 ppb | Below the action level, but detectable |
| 2007-01-01 → 2009-12-31 | 4.5 ppb | Well below the 15 ppb action level |
| 2004-01-01 → 2006-12-31 | 6 ppb | Below the action level, but detectable |
| 2001-01-01 → 2003-12-31 | 5.88 ppb | Below the action level, but detectable |
| 1998-01-01 → 2000-12-31 | 8 ppb | Below the action level, but detectable |
| 1995-01-01 → 1997-12-31 | 0 ppb | Well below the 15 ppb action level |
| 1994-01-01 → 1994-12-31 | 0 ppb | Well below the 15 ppb action level |
| 1993-01-01 → 1993-06-30 | 0 ppb | Well below the 15 ppb action level |
Source: ECHO SDWA bulk download (SDWA_LCR_SAMPLES.csv, SDWIS 2026Q2, file dated 2026-07-09, fetched 2026-09-13)
EPA UCMR5 monitoring, 2024-07-09 to 2025-01-14 · 232 PFAS results at entry points to the distribution system
No PFAS detected. None of the 232 UCMR5 PFAS results for MARION MUNICIPAL WATER DEPT were at or above the method reporting limit. Reporting limits are about 3–5 ppt, so “not detected” means below that threshold — not proven zero.
| Compound | Detects / samples | Max (ppt) | Reporting limit | EPA MCL |
|---|---|---|---|---|
| PFOA | 0 / 8 | < 4 | 4 ppt | 4 ppt |
| PFOS | 0 / 8 | < 4 | 4 ppt | 4 ppt |
| PFHxS | 0 / 8 | < 3 | 3 ppt | 10 ppt |
| PFNA | 0 / 8 | < 4 | 4 ppt | 10 ppt |
| HFPO-DA | 0 / 8 | < 5 | 5 ppt | 10 ppt |
| PFBS | 0 / 8 | < 3 | 3 ppt | hazard index only |
“< 4 ppt” means below the laboratory reporting limit, not zero. ppt = parts per trillion (ng/L). Results are for finished water leaving the treatment plant.
Lithium (also monitored under UCMR5, not a PFAS): detected in 8 of 8 samples, max 182 µg/L. There is no federal limit for lithium.
What PFAS are and how to remove them →
Source: UCMR5 occurrence data, EPA Data Summary July 2026 (UCMR5_All.txt)
EPA Six-Year Review 4 compliance samples for MARION MUNICIPAL WATER DEPT · finished water only · dated data, released 2024
These are the regulated-contaminant samples MARION MUNICIPAL WATER DEPT reported to its state between 2012 and 2019 — the most recent nationwide sample-level dataset EPA has published. Every scored contaminant stayed within its Maximum Contaminant Level (MCL) and averaged below 80% of the limit. Treat this as history, not today's tap water.
| Contaminant | Samples | Average | Max | EPA limit | Status |
|---|---|---|---|---|---|
| Fluoride | 93 | 1.1 mg/L | 1.96 mg/L | 4 mg/LMCL | Within MCL |
| Total trihalomethanes (TTHM) | 20 detects | 0 µg/L | ND | 80 µg/LMCL (LRAA) | Within MCL |
| Haloacetic acids (HAA5) | 2 | 5.75 µg/L | 6.23 µg/L | 60 µg/LMCL (LRAA) | Within MCL |
| Lead (tap samples) | 9056 detects | 2.249 µg/L | 21.9 µg/L | 15 µg/Laction level (90th percentile) | Reported, not scored (compliance is on the 90th percentile) |
| Copper (tap samples) | 90 | 74.133 µg/L | 275 µg/L | 1300 µg/Laction level (90th percentile) | Reported, not scored (compliance is on the 90th percentile) |
Averages count non-detects as zero. TTHM and HAA5 limits are locational running annual averages, so a single high sample is not a violation — we grade those on the average only. Lead and copper rows are individual tap samples and are shown for context; compliance (and our score) uses the 90th-percentile result above. LRAA = locational running annual average; ND = not detected.
Source: SYR4 Six-Year Review compliance monitoring data 2012–2019 (released 2024-03)
A point-of-use (under-sink) system typically runs $200-$600 installed; whole-house treatment $1,000-$3,000+ depending on flow and what has to come out. Tell us where you are and a certified water-treatment installer serving Marion will follow up - no obligation.
MARION MUNICIPAL WATER DEPT · 14,888 service lines inventoried · Q2 2026 snapshot
MARION MUNICIPAL WATER DEPT reports 170 service lines that are lead or galvanized-requiring-replacement (1.1% of the lines it has inventoried), plus 1,025 lines whose material is still unknown. A lead service line is the pipe between the water main and a building, so treated water can pick up lead after it leaves the plant — which city-level testing does not capture. Under EPA's Lead and Copper Rule Improvements, utilities must replace lead lines within 10 years starting in 2027.
Source: EPA SDWIS Service Line Inventory (Q2 2026) · PWS ID IA5751035 · See all Iowa lead service lines. We may earn a commission from filters and test kits, at no extra cost to you.
Groundwater systems draw from wells; naturally occurring arsenic, nitrate, radium and uranium are the readings to watch, along with PFAS near industrial or military sites.
How to test your tap water and the treatment options that actually fit Marion homes
The most reliable way to know what is actually coming out of your tap is a certified mail-in lab test. City-wide EPA data (like the report above) reflects the water leaving the treatment plant, but contaminants such as lead and copper can be picked up from your own service line and household plumbing — so the water at your Marion faucet can differ from the system average. A state-certified lab measures dozens of contaminants at once with results you can trust; you can also find one near you through the EPA's certified-lab list at epa.gov/dwlabcert. Hardware-store test strips are cheaper and instant, but they only screen for a few basics (chlorine, hardness, pH, and a rough lead pass/fail) and are far less accurate — treat them as a first look, not a diagnosis.
Match the treatment to what your test finds. Reverse osmosis (RO) removes the widest range of contaminants — lead, arsenic, nitrate, PFAS, and dissolved solids — which makes an under-sink reverse osmosis system the most thorough choice for Marion households with heavy-metal or PFAS concerns. If your main issue is taste, odor, or chlorine, an activated carbon filter (pitcher, faucet, or under-sink) is simpler and cheaper and handles chlorine and many organic compounds well, though carbon alone does not remove arsenic, nitrate, or most PFAS. NSF-certified pitchers rated for lead reduction are the easiest way to start today while you decide on a permanent setup.
We may earn a commission from testing kits and filters purchased through these links, at no extra cost to you.
What Marion residents measured at their own tap (ZIPs 52302). All reader results →
Reader submissions are unverified and shown separately from EPA data. They reflect one tap on one day, not the utility's compliance record.
No reader results for Marion yet - yours would be the first. A hardness or TDS number from a $10 strip kit is enough to start the map.
Help build the first reader-sourced water map. Enter whatever your test strip, TDS pen or lab report shows - one number is enough.
Marion ranks #16 of 24 graded Iowa cities.
Deep-dive guides for the specific contaminants EPA data flagged in Marion's water, with removal options for each.
Yes — by EPA's records Marion, IA tap water is safe to drink and earns an A. The grade rests on lead at 8.3 ppb (90th percentile) — under the 15 ppb action level but above 5 ppb. Lead from your own service line or plumbing is the main risk city-level data cannot see, so homes built before 1986 should still test at the tap.
MARION MUNICIPAL WATER DEPT's most recent Lead and Copper Rule result (2022-01-01 to 2024-12-31) was 8.3 ppb at the 90th percentile, below EPA's 15 ppb action level. Because lead usually comes from service lines and household plumbing, homes built before 1986 should still test at the tap.
No. None of the 232 UCMR5 PFAS results for MARION MUNICIPAL WATER DEPT (2024-07-09 to 2025-01-14) were at or above the reporting limit of roughly 3–5 ppt.
No. EPA's SDWIS shows no violations of any kind for MARION MUNICIPAL WATER DEPT since 2016.
MARION MUNICIPAL WATER DEPT reports groundwater as its primary source and serves about 41,623 people (EPA PWSID IA5751035).
Optional but sensible. The findings on this page are below federal limits; an NSF-certified pitcher or under-sink filter handles lead and improves taste.
Lead was found at 8.3 ppb (90th percentile) in Marion's latest tap sampling — below the action level, but there is no safe level of lead.
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Filters rated for lead reduction
Waterdrop's lead collection — every filter here is selected for lead reduction, so you can compare options rated for this exact problem.
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Whole-house system — treats every tap at the source
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Based on contaminants detected in your water, these resources may be helpful:
Find the right filter for your Marion water quality needs:
Tap water is one piece of the picture — our sister sites cover the rest for Marion, IA.
County radon prediction and EPA zone for homes around Marion.
Arsenic and nitrate risk for homes on a well instead of city water.
Understand your water better with our in-depth guides on contaminants, filtration, and water safety.