Well water in Rockville, Minnesota
In Rockville, chloride was detected in 100% of 32 tested well samples from USGS Water Quality Portal.
The strongest signal is lead: 5% of 19 local samples were above the limit, too few samples to carry the headline but first on the test list below.
149 test results across 9 contaminants from at least 22 wells, 1984 to 2025; chloride has the most at 32. Data refreshed September 3, 2026.
Compiled by Nick at Well Water Nerd from public records. How these pages are built
What individual samples found
Each row summarizes every public sample for that contaminant inside Rockville. Above limit means above the EPA maximum contaminant level; where EPA has no enforceable limit, the row shows a health guideline or nuisance level instead.
| Contaminant | Above limit | Samples | Detected | Median | Highest | Limit |
|---|---|---|---|---|---|---|
| Lead 1994 to 2015 | 19 | 11% | 0 | 31.5 | 15 ug/L EPA limit | |
| Copper 1994 to 2015 | 19 | 16% | 0 | 0.012 | 1.3 mg/L EPA limit | |
| Nitrate 1984 to 1999 | 10 | 50% | 0.25 | 2 | 10 mg/L EPA limit | |
| Chloride 1984 to 2025 | no limit | 32 | 100% | 28.2 | 125 | 250 mg/L nuisance level |
| Manganese 1984 to 2015 | no limit | 21 | 95% | 212 | 2,395 | 300 ug/L health guideline |
| Iron 1984 to 2015 | no limit | 21 | 95% | 1330 | 22378 | 300 ug/L nuisance level |
| Sodium 1984 to 1999 | no limit | 20 | 100% | 11.3 | 61.4 | 20 mg/L health guideline |
Sampled fewer than 10 times, too few to summarize: Arsenic (3), Fluoride (4).
Closer than the town
See the sampled wells near your address
The same records, drawn around one point: which wells within a few miles were sampled and what they found, how deep the wells next to you were drilled, and any leaking tank or cleanup site within a mile.
Check my addressWhat this means
The contaminants most often above their limit here are lead (5% of 19 samples). A well next door can differ sharply from yours because bedrock fractures, well depth and plumbing all matter, so these rates describe the area, not your tap.
Chloride, Manganese, and Iron are widespread in local groundwater. They are mainly a staining and taste problem, but high manganese also carries a health advisory for infants.
What to test for in Rockville
- 1Lead5% of 19 local samples were above the limit.
- 2Coliform bacteriaRecommended for every private well, every year.
- 3NitrateRecommended for every private well, especially near farms or septic systems.
- 4ArsenicAbove the limit in 1 of 3 local samples; too few to quote a rate.
- 5ChlorideDetected in 100% of local samples.
- 6ManganeseDetected in 95% of local samples.
- 7IronDetected in 95% of local samples.
- 8Volatile organic compounds (VOCs)7 leaking underground storage tank sites on record locally.
Test your Rockville well for lead, coliform bacteria and nitrate
Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.
Order the Tap Score well water test kit, from $209Already tested? Upload the report
Just want bacteria checked first? Tap Score coliform and E. coli test, $99. Coliform and E. coli are the tests every well needs every year.
Want a quick look before paying for a lab? Home well water test strips on Amazon check hardness, iron, pH and nitrate in minutes. They are a screen, not a result: arsenic, bacteria, uranium and PFAS need a certified lab.
Affiliate links: the merchant pays us a commission and the price is the same for you. It does not change what the data above says. As an Amazon Associate we earn from qualifying purchases.
Where to get a well tested in Minnesota: certified labs, state programs and prices.
Already have results back? Get your lab report read against the Rockville numbers, $29. Every line explained, ranked by what matters, with the fix for each.
Wells in Rockville
242 domestic wells in Rockville are on record with the state since 1971. 31% are drilled into bedrock, and the typical well is 64 feet deep (one in ten goes past 135 feet).
In a typical Rockville well, bedrock starts about 68 feet down.
Find your own well's report
The state keeps the driller's report for most wells drilled since 1984. It tells you how deep your well is, where bedrock starts, and how much water it makes, which decides what treatment can work.
- Open Minnesota Well Index and choose Water Well.
- The record shows depth, casing, depth to bedrock, aquifer, static water level and the driller; new wells since 2008 also show the arsenic test result.
Wells drilled since 1974 have records; older wells appear only if a later owner reported them.
The rock under Rockville
Not a principal aquifer
The USGS map places this area outside any principal aquifer, which usually means wells here draw from fractured bedrock or thin local deposits rather than a large regional aquifer. Bedrock wells of that kind are where arsenic, radon and uranium turn up, and yields vary from well to well.
Classification from the USGS Principal Aquifers of the United States (national map, 2003 edition, GIS release 2015), read at the town centroid. A single well can sit in a different unit, especially near a boundary.
Official help in Minnesota
Two places to start that are not selling anything: the state program that answers private well questions, and its list of labs certified to run drinking water tests. A certified lab is the difference between a result you can act on and a number.
- Wells and Borings, Minnesota Department of Health
- Accredited Laboratories as Well Partners, Minnesota Department of Health
Contamination sources on record in Rockville
MPCA records 7 leaking underground storage tank sites in Rockville, among 19 regulated sites in total. Groundwater does not follow property lines, so a well within a few hundred feet of one of these is worth testing for what that site could release.
- 7
- leaking underground storage tank sitesGasoline and heating oil that leaked from tanks move through groundwater as benzene, MTBE and other volatile organic compounds.
- 4
- registered underground storage tank sitesRegistered tanks are regulated and inspected; they matter most when they are old or near a shallow well.
- 8
- lined landfills and transfer facilities
Treatment that fits the local profile
Lead
Point-of-use reverse osmosis; Certified lead-removal carbon filter; Neutralizing filter to raise pH and stop leaching
Manganese
Oxidizing filter (greensand, birm) whole-house; Water softener (low levels); Point-of-use reverse osmosis
Iron
Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration
Systems we would look at first
Some links below are affiliate links. If you buy through one, the merchant pays us a commission at no extra cost to you. It does not change which products we list or what the data says.
For lead
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
For lead
Acid neutralizing filter
whole-house, at the point of entry, about $1,200
Raises pH so plumbing stops leaching lead and copper.
For lead
Aquasana SmartFlow reverse osmosis
under-sink or countertop, about $225
Certified to NSF/ANSI 58 and 53 to reduce arsenic (96%, pentavalent), fluoride (90%), lead (99%), nitrate, nitrite and PFOA/PFOS at the kitchen tap, with a remineralizer.
For manganese
Iron and manganese oxidizing filter
whole-house, at the point of entry, about $1,800
Air-injection or greensand media; fixes staining at the source.
Free, no obligation
Get on the list for a free in-home water test in Rockville
No water treatment company serves Rockville through Well Water Nerd yet. We are signing licensed companies on county by county: they test at your tap for free, walk you through the numbers, and quote treatment only if something needs fixing. Leave your details and you are first in line. Nothing is shared until a company joins for Rockville, and you get an email naming it first.
Common questions
How deep are wells in Rockville?
The typical domestic well in Rockville is 64 feet deep, based on 242 wells reported to the state since 1971. One in ten is deeper than 135 feet. 31% are drilled into bedrock.
How often should I test a private well in Rockville?
Test for bacteria and nitrate every year. Test once for arsenic, uranium, radon, fluoride, manganese and PFAS, then again every three to five years or after any change in taste, color, or plumbing.
Towns near Rockville
Closest first. Groundwater does not stop at a line on a map, so the next town over is a fair second opinion.
Want the numbers themselves? Download the Minnesota dataset as CSV, every county and town, with the sources named.
Sources
- USGS Water Quality Portal: 149 samples in Rockville. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
- Minnesota Well Index: 300 well records in Rockville, 242 domestic. Well construction records from the Minnesota Well Index (Minnesota Department of Health), non-public-supply wells. Only aggregates are shown; owner names and addresses are never stored. Retrieved September 15, 2026.
- MPCA regulated sites: 19 regulated sites located in Rockville. Tank, leak, remediation, Superfund and landfill sites from the Minnesota Pollution Control Agency What's In My Neighborhood database. Retrieved September 15, 2026.
Non-detects count as samples and are treated as zero when computing medians. Exactly at the limit counts as not above it. A sample belongs to the town containing the well's reported coordinates.